I don't think you're being too cautious. I'd also include Beckett as an acceptable TPG but those holders are very stout.
If you see a card in a GAI holder it's probably authentic but there's a greater chance that it could be a card that was altered and placed into a holder with a numerical grade (more so than the other TPGs).
No problem with being cautious.
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fr3d c0wl3s - always looking for OJs and other 19th century stuff. PM or email me if you have something
cool you're looking to find a new home for.
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