As a small-time collector, and far from an expert, the concern this thread raises for me is, how much of this stuff has been circulating for years, or decades? If it was as simple as avoiding certain sellers, that's easy enough. But with the frequency cards are sold and traded, I would guess even the most reputable dealers in the hobby sometimes sell, unknowingly, cards that have been worked on.
Because, how could they know the difference, especially if it had been graded and slabbed?
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