If there's no one to claim the wallet and money, then the money is mine.The wallet, however, I'll likely turn that in the lost and found.
Easy. Hand it in to the Police. It's the right thing to do.
I'd give the case to charity so other people can benefit!
Mwahaha! The money is mine! Finders keepers, losers weepers. Suck on that!
I'd keep the money but spend it on family and friends.
Use the money to take Loony Bob and Psychotic out on a date!