Finders........Keepers?

Does this ever happen to you.......you are aimlessly wandering in a venue maybe a  hotel/nightclub and you find money just sitting there on the floor?
I don't recall this ever happening to me but have had two texts tonight from the SAME person who has scored a $50 dollar note and then his little brother note, this time a $5 note in this exact manner!!
What do you do in this situation ask the crowd "Does this belong to anyone?"
                                                   What would the response be?
                                                         What would you do?