Why was he not caught when himself or one of his associates attempted to pass off the chips at the casino, he obviously found out some way they were worthless.

Why was he not caught when himself or one of his associates attempted to pass off the chips at the casino, he obviously found out some way they were worthless. I am really surprised the Bellagio cage allowed someone with a chip that couldn't be cashed to walk away AFTER a robbery had recently taken place... The whole chain of events is suspect.