How good you talking on cost? I mean if you want to reholder, is that even doable?
I know they check the comic first, to see if the busted case cause damage. But it would depend on how good were talking in cost. If the case is damaged too hard core that the book was damaged they'll regrade, which brings to mind if it was cracked before the seller sent it and used an old pic? Really a non starter, you've received it at cost. You can definitely return either to seller or cgc.
All depends on whatcha whatcha want! Beastie boys