Yeah, this would be one hell of a fake if it's real.
The ebay description seems to contradict the photos which were posted a few days later however.
Second, the cartridge is pretty different from a typical Atari cartridge right? Would it have been that easy to distinguish? Dunno, I find that part of the story odd.I only recognized that it was a 2600 game because of the cartridge. That would mean the cartridge was visible in the box. The box swung open or it might have had a clear window that showed the cartridge.