Posted By:
ockdayBrian..because this has happened to me several times..I now send to SGC the cards that I want to cross over in their slabs(PSA, GAI) with instructions to crack them out ONLY if they are gradeable.
If SGC determines the card is not gradeable by their standards then you still have the card in its original slab. This is not 100% as once a card was cracked out then determined to be ungradeable.
I know this doesn't solve your current dilemma but should help for the future.