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JimiLeave them in their PSA slabs with a minimum grade requirement. They will grade the card fairly, but keep in mind, if you don't put a grade requirement on the submission form, SGC may grade the card lower than what you expected. Generally, they will put the PSA slab in a plastic graded card sleeve and circle the area on the sleeve where the grade doesn't meet the requirements. I really appreciate this feature with SGC. As most have said above, SGC will grade it fairly.
Jimi