My guess is the card was kept in a humid environment or got wet at some point. That will thicken a card. Ever drop a paperback book in a pool (or a bathtub, or an ocean, or a sea, or a pond, or a river, or a billabong)? Same effect.
The only reason why cards don't thicken when collectors purposely soak them is because they then dry the cards between paper towels under pressure, ie with a weighted object, such as a heavy book, on top.
Last edited by Anthony S.; 03-03-2010 at 11:18 AM.
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