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dennisthere are creases in cards that can only be seen under magnification and would not be noticed under eye inspection. i believe these are being removed (as leon stated 85%)by collectors/dealers and are getting past the slabbers. IT IS ALTERING but is never going to be detected,and the crese will never come back. then there is an obvious creased card. it is forever a creased card and alteration will be obvious to all. to improve it is alteration and i think we have all seen a few of these.