The biggest problem I've seen is with Topps stamps and other thin paper issues. A while back, I bought a PSA 9 1974 Topps stamp, and when it arrived, the stamp had turned 90 degrees and migrated to where it was entirely above the top gasket in the slab.
I can't see any damage to it, but I don't know for sure if it wasn't damaged.
Steve
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Successful BST deals with eliotdeutsch, gonzo, jimivintage, Leon, lharris3600, markf31, Mrc32, sb1, seablaster, shammus, veloce.
Current Wantlist:
1909 Obak Howard (Los Angeles) (no frame on back)
1910 E90-2 Gibson, Hyatt, Maddox
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