It is a promo box I am positive of that. This is Straight from the Atariage Web site,
"The box that these came in looks like a normal box except it has "Not for Resale, For promotional Purposes Only" stamped on the underside. We're not sure if there are any technical differences to the console, or if it was just an early edition of the new style for retailers to distribute in advance of sales."
And that stamp was taken off.
I am taking any offer on this system now. Let me know PM me or something.