PARIS (AP) — A U.S. charitable foundation said Wednesday that it was the anonymous bidder that paid $530,000 for 24 Native American masks in a contested Paris auction two days ago, and will return them to the Hopi and the San Carlos Apache tribes.

"These are not trophies to have on one's mantel," said Gregory Annenberg Weingarten, director of the Los Angeles-based Annenberg Foundation, which revealed itself to be the secret caller that triggered a bidding war in Monday's highly publicized auction.

He added: "They do not belong in auction houses or private collections."

Twenty-one vividly colored masks made of leather, horsehair, wood and feathers bought at Drouot auction house will be returned by the foundation to the Hopis and three hood masks to the San Carlos Apaches.

It was a happy ending, at least in one chapter in the Hopi tribe's battle to regain its tribal patrimony, following a series of legal setbacks in efforts to delay the sale of the masks last week, arguing that they represent ancestral spirits and shouldn't be sold. The tribe has said it believes the masks, which date from the late 19th and early 20th century, were taken illegally from a northern Arizona reservation in the early 20th century.

See photos of the masks. Story continues below.

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  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Angwusnasomtaqa' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Chakwaina' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Ho-ote' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Tasavu' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Dawije' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows a 'Sio Hemis Cachina' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Kana-Kwe Mosona' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Suyangevif' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Heheya-Aumutaka' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows a 'Sio Hemis Cachina' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Hemiskatsinmana' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Komantsi' sacred mask of the Hopi, a native American tribe from Arizona. 70 masks will be auctioned on April 12, 2013 despite the fact that two museums of Arizona and the Hopi tribe asked for its cancellation. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Kwaakatsina' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Hanomana' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-CULTURE-TRADITION-AUCTION

    A picture taken on April 5, 2013 in Paris shows the 'Acoma' sacred mask of the Hopi, a native American tribe from Arizona. The looming Paris auction on April 12, 2013 of some 70 ceremonial 'Katsinam' masks originating from the Hopi tribe of Arizona has cast light on the failure to prevent sacred American artifacts being sold overseas. French justice will rule on April 12 whether to suspend the auction of these 70 items, blessed with divine spirits to the Hopis, who will be defended before Paris court by Survival international association. AFP PHOTO / MIGUEL MEDINA (Photo credit should read MIGUEL MEDINA/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a view of four rare masks (circa 1800s) from the Pueblo Andamamae in New Mexico during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a view of four rare masks (circa 1800s) from the Pueblo Andamamae in New Mexico during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a view of three Hopi masks from Arizona during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a Western Apache mask (circa 1940) during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a mask of the third Mesa Angwushahay'i during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a Katsina Eewiro mask (circa 1880-1900) from the Hopi tribe in Arizona during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    (L-R) A photo taken on December 9, 2013 shows a Wakaskatsina mask (Circa 1930), a Katsina Jemez mask and a Hakto mask during (Circa 1910) during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris. The Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a Katsina Hapota mask during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

  • FRANCE-US-HERITAGE-ART-AUCTION-DIPLOMACY

    Photo shows a mask of the third Mesa Angwushahay'i during an auction of sacred objects from the Hopi and San Carlos Apache Native American tribes in Paris on December 9, 2013. A Paris auction of the sacred objects will go ahead despite objections from the United States and activists, auctioneers EVE said. The US embassy had asked Paris to suspend the sale of the colourful ceremonial masks, head-dresses and other objects after the failure on December 6 of a legal challenge by advocacy group Survival International on behalf of Arizona's Hopi tribe. AFP PHOTO / JOEL SAGET (Photo credit should read JOEL SAGET/AFP/Getty Images)

The U.S. Embassy had also called for a delay so that tribal representatives could come to France to identify the artifacts and investigate whether they have a claim under the 1970 UNESCO Convention on the Export and Transfer of Ownership of Cultural Property, to which both France and the U.S. are signatories.

David Killion, the U.S. Ambassador to the UN cultural agency, who had voiced strong support for the Native American tribes in the past days, issued a statement Wednesday — co-written by the U.S. Embassy — calling the charity's move a "generous act."

But Killion suggested that the battle for Native American property rights was by no means over.

"The need for real dialogue in advance of such public sales, along with stronger legal protections, was once again made apparent this week," added the statement, reiterating US officials' position that countries such as France tighten laws to protect important sacred objects.

Though there will be no celebrations in the Hopi tribe, with many Katsinam masks still in commercial circulation, the news was met with optimism.

"Our hope is that this act sets an example for others that items of significant cultural and religious value can only be properly cared for by those vested with the proper knowledge and responsibility. They simply cannot be put up for sale," Sam Tenakhongva, a Hopi cultural leader, said in a statement Wednesday.

The Drouot auction house said the total sale was for $1.6 million, including a sacred "Crow Mother," a menacing Hopi mask with billowing black plumes, which sold for nearly twice its expected value at $171,000.

Pierre Servan-Schreiber, a lawyer who represents the Hopis, told The Associated Press that he'd personally bought one mask to return to the tribe.

In a similar dispute in April, a Paris court ruled that such sales are legal, and around 70 Hopi masks were sold for some $1.2 million, despite protests and criticism from the U.S. government and actor Robert Redford.

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Thomas Adamson can be followed at Twitter.com/ThomasAdamsonAP