Not saying its what happened in this particular case necessarily, but I've pulled creased modern cards too. In one case, the creasing was quite severe and on several cards in a Heritage box. The depth of the deep creases made it evident that the sheet itself was creased before printing, and the images printed onto the stock after the creasing had happened. I could recreate a row on the sheet based on the sequencing and the creases, thought it was kind of cool actually because they were all commons. Still happens without tampering, that's for sure
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