How fickle is Amazon about editions/covers? I've got Signature Edition and would trade it in at that price, but don't want to go through the hassle of sending it and having it returned if they're just going to turn it away.
Amazon had my Signature Edition in copy of AC:R "Processing . . ." for four days before rejecting it as an "Incorrect Edition." I contacted Customer Support and explained that the GameStop pre-order edition is, aside from coloration of the cover and a small "Signature Edition" banner, identical to the standard retail version. I also noted that they've accepted retailer-specific editions from me in the (e.g., BBY B:AC, Target R&C All 4 One).
I ended up with a promo credit for MORE than my locked in value. And I get the game back.