'52s won't fit in them anyways. But yes, old sheets not made of mylar can seep into cards. However, I figure most of those sheets have already turned yellow or turned sticky from degrading.
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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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