I would have called a friend, and guarded that cash for a while. Let the frien pick it up.
Finders keepers bish. If my friend dropped any amount of money, I'd give it back. If I see a lady at the grocery store drop a twenty, I'll pick it up for her and give it back. A large amount of cash in plastic bags, mine bish, mine mine mine mine, get your fucking hands off.....mine!!!!