<human>: Can you summarize the given text in a few sentences?

I was playing tennis with my girlfriend, and I guess I left the zipper open on my carrying case for my racket (which had my wallet in it). As I was driving home, we went to stop into a comic store to grab some MTG cards, when I realized my wallet was gone.

Went back to the tennis court, and as I was looking around, someone said "hey, is your name ctrlaltd1337?" She had seen us playing tennis beforehand, and said as she was walking onto the court, she saw my wallet (it had dropped just outside of the fence), but I was already driving away. She showed me on her phone that she was in the middle of [411'ing] me, and when she gave it back to me, not one thing was missing, not even the cash I had in it. I offered her $40, but she declined and said that anyone would have done the same thing. I disagreed with her, but thanked her once again.
<bot>: Lost my wallet, stranger went out of there way to make sure I got it back. What has someone done for you that made you feel like there are still good people left out there?