I once accidentally tossed out a Flamingo chip at the Cromwell cage and apologized. But the cashier totally floored me by saying, no problem, we take those. What else have you got for the nearby casinos? Turns out, there is some service whereby runners pick up other casinos' chips and somehow they all settle their accounts eventually. Not every Las Vegas casino is in on the deal. The broad smile on the Cromwell cashier's face led me to believe that the accepting casino, shall we call it, gets to charge a Finder's Fee to the casino actually owning the chips.