Imho, it's a little naive for anyone with a sizeable collection to think they don't have cards that have been altered in some way, even the graded one's and imho especially the higher graded one's.
In many cases it's probably almost impossible for the grading companies to catch the alterations without having access to how the card looked before the alterations.
In the case of a high profile card like this Plank, I do think the grading companies have some responsibility to check past sales of the card to see if it's a previously sold card that has been altered.
-Alan
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