The next to last box of Polymax that I ordered arrived in a similar box---no product name, just "Kodak special Paper". The paper base was different from what I was used to (pure white back, warm tone front instead of uniform tone throughout) but it seemed to print about the same. Most of the usual detail was missing from the label; I can't recall if there was a product number or not.
My guess would be that it was made outside the US, and either repackaged or imported as gray-market. Surely no one would clumsily counterfeit photo paper, would they? (If they do, we should find them and force them to make Polymax for us---it was nice paper.)