I always reholder anything in an old slab. Never once had a problem. The only thing you need to worry about is if the slab is damaged or cracked, then they will treat it as a raw card and will regrade it per today's grading standards as they will not honor the grade in that case. If it's an old slab, that grade WILL go down 99% of the time.
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If it's not perfectly centered, I probably don't want it.
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