Want to have some real fun with them?
Go put a bunch of money in a slot machine, then cash out right away. Take the payment ticket and make a photocopy of it, cut it out to size, put the copy in your wallet and cash in the original ticket.
When she takes the wallet, what do you think the chances are of her not going into the casino and trying to cash this copy of a $1500-$2000 slot voucher? What do you think the chances of her not leaving the casino in handcuffs are?
Come to think of it, that would be a nasty trick to play on any criminal in a casino venue. Get robbed or pickpocketed, just read the police blotter to see who got arrested at that casino that night for passing forged paper, and you can get him another charge on top of it.