You already know how I feel about the autograph
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As for future value because of it being an Aflac card? A bad autograph will decrease that cost. Not many people will care to have a card like that. The worst part is that it was signed in a ball point pen so if you were to wipe the autograph it would still have the indentation marks from being "signed".
The seller can give you the run around all they want but you are protected by eBay. You can file a claim stating that the item isn't as described and get a refund hopefully.
Best of luck!