I can't remember the last time I ordered a non-rare video game or movie from Amazon that didn't ship from Dallas. Books, hardware, and pretty much everything else tends to come from who knows where. Considering Retro Game Challenge is the only thing I ordered Amazon hasn't pimped on the site or in emails, I'd guess it's the game responsible. The question, then, is why didn't the Dallas shipping center have the stock for this order? Was it because the game is selling faster than anticipated, Amazon didn't bother to stock much because the buyer thought he worked at GameStop thanks to blunt head trauma, or somewhere in between?
My money's on "glitch in the Matrix," personally.