I've mostly collected coins so I understand the coin side of TPG pretty well. Without a doubt, there are coin doctors and fraud. Most of that centers around artificially toning coins with vibrant colors. An untoned silver dollar in MS65 may bring a couple hundred dollars but with attractive multicolored toning, a couple thousand.
And the TPG's probably aren't any better at weeding that out than they are weeding out doctored cards.
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