I tried to search the threads and couldn't find any prior posts on this subject. Just came back from Vegas last week and when Hubby went to our bank to make a deposit, the ATM kept spitting out one of his $100 bills. When he took it inside he was told it was counterfeit. The bank let him keep the bill because he didn't include it in his deposit. My questions: 1. Do the casinos keep track of all their bills (serial numbers)? 2. Should my husband contact the casino? Any advice would be appreciated. Thanks!