That's exactly what I do Dennis. You can sometimes find 5 or move cards in a 20 minute scan of a casino using this process. I work in security in a casino myself so be careful not to pick up abandoned vouchers while looking for the slot cards. With the "eye in the sky" watching picking up vouchers can cause you to be evicted or worse. Enjoy harvesting cards because that is the best way to gather extras for future tradiing.