If you accidentally found someone's bitcoin wallet, would you really return it to its owner? Honestly , I'm skeptical of people who say this to try to be good people . The line between good and evil is very thin and if I were in that situation, I don't think I would be able to play the role of a perfect good person .
Personally, I've never been in that situation, but honestly, I don't know what I would do with bitcoin . If it was a large sum worth millions of dollars then I think it would be hard not to be tempted, I think I would just return it to the owner if the amount of bitcoins was too small for me . We should be honest, don't try to live a lie. We work hard and diligently to earn a few satoshis every day and it would be a lie to say that we will return to the owners when we find a few bitcoins or a few dozen bitcoins .
If you care with every satoshis you make every day, I don't think you accept to lose a satoshi.

But it's good if you want to be honest, this is a part of morality, since we're live in capitalist society, it's nothing surprising people want to lose almost everything in order to earn money. As some people said, it's better to cry alone in luxury house than together but you can't even afford to buy foods.