>>Of course some casinos have put a sign on the machines saying that the strike you win may not be on display

Reminds me of the time I was at Barbary Coast, trying to win enough strikes to trade for their $200. They refused to take in trade the old strikes that the machine dispensed which weren't on display, pointing to the sign on the machine that only current strikes could be used for trade. I guess current strikes don't necessarily include all those currently in the machine, only those currently on display.