Hard to generalize when the question covers the NM-MT, MINT and GEM MINT grades. I think there are many legit NM-MT cards out there but think the percentage of legit MINT cards is smaller and the the percentage of legit GEM MINT cards is even smaller than that. I have not seen all of the TPG 8s, 9s and 10s but have seen enough that I would be confident saying more than 20% have been trimmed. I am sure there is a correlation between the decreasing number of over sized EXMT and NEAR MINT cards and the increased number of MINT and GEM MINT cards. I have yet to see an over sized MINT or GEM MINT but have seen many in lower graded holders.
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