Yes, I saw this, and it seemed exciting at first. It's not NIB, though; it's been refurbished by a third-party IT service. Notice:
• Signs of use (see key close-ups)
• It's been rewrapped (IBM didn't pack Model Ms like this)
• It has someone else's detail sticker on it (there'd be no need for that with a NIB board)
• It's in a box from a standalone PS/2 system, rather than the original bulk air-system packaging.
You can't blame them for trying to position this as well as they can to capitalize on the hysteria for "rare" ( = "I have something you don't"} items.