Major casinos have big ticket thefts all the time we get a couple a week, where credits are cashed out by another party. What you did is minor. The term for what you were doing is called "Buffalo Hunting" - just getting the lonely credits from the machine. I would not lose sleep over it. Just know when you go into Cactus Pete's, leave the credits alone or just use the ticket redemption machine and not say a thing. Just sum up your trip as a new casino experience. Believe me they deal with a lot of people every day and will not remember your face the next time you are there.