I saw the auction too, and instantly, thought it was a back swap. My copy has the newer, longer text style back label.
It appears to me, some of the people with the old style, want it to be legit so badly they deny the fact that they picked up a used copy and the fact, that it has passed through many hands, before they came to own it. At any point along the way, it only takes one person to swap the back. I need concrete evidence proving this was released with either back. With that said, my stance is it is possible they had original older style back labels, but highly unlikely.
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WANTED NES: Box- Bomberman II, Bubble Bobble 2, Chubby Cherub, Color A Dinosaur, Pro Sport Hockey, Volleyball
Manual- Dragon Fighter, Jetson's, Operation Secret Storm, SCAT, Stack Up, Stinger, Sword Master
Manual and Box- Arkanoid, Jimmy Connor's Tennis, Little Ninja Brothers, Mickey in Numberland, Sqoon