Sofie, a student in Denmark who asked that we not use her real name, said on Reddit that a few of those photos were of a man who she remembers sitting next to her on the train right before she realized her phone was gone.
"I wanted to retrieve the photos I had lost along with the phone, so I checked my photostream," she told The Huffington Post. "That's when I saw these beautiful pictures I posted here."
Sofie says she never got her phone back, but she did get some justice: A week after she sent the photos to the police, they called to say they'd arrested the men in the same subway station where she'd last had her phone.
View some of the photos below, and see the rest on Sofie's Imgur page.