Most places like that won't let you accept tips. You could get fired if you do. I turned down a $5 tip at Kmart during my first year there. I accepted a $20 tip on the last day, though. Because what are they going to do, fire me? It was the shadiest thing, too. He handed it to me while shaking my hand like it was a drug deal.
What I actually did was spent 4 hours checking him and his crew out. They go around to closing stores and buy almost everything that's left over on the last day, then resell it at a store they own in Iowa. By the time they were leaving, I was back in the office, so he asked someone to find me to thank me, the slipped me the 20...
But that's awesome that they had your purse!!