I agree with you re early PSA grades. In the early days of grading it was still possible to find a fair number of high grade, unaltered raw cards. At some point, with a relatively efficient market, the supply of those diminished as more and more were graded. So if there continues to be a steady influx of high grade cards coming out of the grading services, it seems reasonable to infer that more and more are altered in some way.
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