I hope my memory is faulty but I seem to remember someone saying that when they had some commemorative chips autographed by the person being honored that the casinno then considered the chips to be unredeemable. Is this true? Do casinos vary in their treatment? I am looking for this info because I have $44 worth of chips that have been defaced as in the scan and wonder if it would be worthwhile to have them returned to the casion.