根据故事内容，把下面的故事复述补充完整。

When I worked as a waiter at a restaurant, I happened to before Christmas. I didn't open the wallet because __. I thought if it contained something valuable, the owner would return to ask for it. An hour later, a man came to ask if . After he described the wallet exactly, I gave him the wallet. Having learned that I hadn't checked the wallet, he opened it and showed nearly $800 in cash inside. He then gave me as a reward for my honesty. After that, I am wondering whether I would keep it if I knew what was in the wallet. However, I think the feeling of returning the wallet was worth .