history: Last weekend at walmart the cashier gave me back too much change and i kept it. Last weekend at walmart the cashier gave me too much change_comma_ even though I noticed this i kept it How much did she give you over
current: I gave her a 10 and she gave me change for a 20, so 10 bucks
next: Most places will make her replace the 10 so you should really go back to there and explain what happened