Is it possible this is due to the general level of humidity (or lack thereof) in the air? We talked about it regarding the cracking and bending of Kellogg's 3-D cards and I'm thinking this may be the culprit here as well. In New York, my Kellogg's cards would eventually curl up like crazy over time, but out here in the ridiculous desert-like Northern California area, the cards I have remain as flat as boards. The problem could be a function of what part of the country the 63's have been kept in all of these years.
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