Similar thing happened to me last year during rush-hour at a trainstation.
What i did was i picked up all the money and then did a quick assessment of the "victim" who had lost the money.
Seemed like a reasonable fellow (white, in his 30s, probably going on a longer trip judging by the clothes, luggage and backpack) so i gave him all the money back.
If he had looked like a criminal (looked dodgy or had shifty eyes) or would have been muslim or black i wouldn't have returned the money since i do not support neither ISIS, gangrape or porchery.
Felt really good to have saved his vacation or whatever it was.
It was the right thing to do Palpatine!