He didn't do anything wrong by taking it, but he should at least an effort, however futitle, to return it. How would you like to be out of 250 bucks? "Finders Keepers" and "It's their fault for losing it" are just excuses to try to make it morally right. "It would be impossible to find the original owner" is also just an excuse of laziness. There are many ways one could go about doing it. Some have been mentioned in this thread. Yeah, it may take time out of your "normal life", but whatever happened to helping your fellow man?