The main reasons that there are very few "how to detect trimmed/altered cards" threads is that if you put that information out there, the trimmers also read it and improve their techniques.
Did you read the following pages here at Net54?
https://www.net54baseball.com/forum/...ivecenter.html
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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