This is a great story. A guy named Todd Bieber, from New York, found a canister of undeveloped film which had fallen in the snow in a park in Brooklyn. He took it home and developed it with the idea of trying to find the owners.
He thought they must be tourists, so he made a Youtube video in the hope that it would get passed around and someone who knew who the people in the photographs were would see it, so they could get in touch and collect it.
I don’t want to say any more, but watch the videos: