I have all 4 $5 chips with the incorrect date for the super bowl 2002. the date was changed due to the 9/11 disaster. I also have all 4 $5 chips with the correct date. The incorrect ones were never issued (to the best of my knowledge); however I was able to talk one of the casino cage tellers to sell me four. Can anyone tell me if they are as rare as I hope they are?