If I found 100 dollars wadded up I would return it because it is the right thing to do.  Maybe if they don’t call for it a month or so I would probably keep it but if they do call for it and I spent it I would probably give them my money.  Cause maybe that was all their money and they had to pay something?  Would you want to work for some money and want to buy something and reach in your pocket and only have a penny?  I wouldn’t.  Don’t let nobody convince you to keep the money.  What if a decent person walked up to you and said if you have seen a hundred dollars?  Be polite and give it to them.