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Joe D.SGC policy might be different than GAI.
Leave it in the slab.
If you want an SGC Slab - I would show the card to SGC in the slab and ask them if they would cross it over to an SGC Authentic. They may not.
If you crack it out, GAI might reconsider putting it in a slab themselves, and SGC might not either.
Thats how I would approach it anyway.