I along with a few other people are curious as to the legality of scenarios logically similar to the hypothetical described below:
Assume someone places their wallet on the ground in a public place, then someone picks up the wallet thinking it was theirs's, puts money in it, then leaves it on the ground and proceeds to walk away leaving the wallet on the ground. Then, at a later time, the owner of the wallet who originally left it on the ground in a public place comes over and picks up their wallet, and notices that for some odd reason someone decided to put money inside of their wallet that was left in a public place. Can the owner of the wallet keep the money that was put in their wallet? Or would it be illegal to take the money being that the person (not the owner of the wallet) who put the money in the wallet wasn't planning on giving it away? Or would the law state that because the wallet was in a public place at the time of the person putting money in the wallet, the person that put money inside has no expectation of someone not taking the money?