Ahh, Memphis Region FDIC, you gotta love 'em. "Yes, Virginia, it really is true that people who do not cash official checks promptly are all money launderers and evade income taxes."
I don't have the time or resources right now to determine whether Mississippi has adopted Section 3-411 of the UCC, but you are going to need to figure it out and then decide what you would require to reissue the check based on the circumstances related by the purchaser. Trust me, how you handle this situation is a lot more important than whether your examiners make some inane reference in your written report of examination.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.