Well, this tank may be stock, and it may be old, but it ain't "new." There's obvious signs of a petcock and filler cap having been mounted on this tank, indicating use on a bike. I have a genuine NOS R/W/B fuel tank, so I know they don't come with those items mounted. New is new, used is used, and this item is used.
Having said all that, this is a rare tank, offered in the rarest of the second-gen VFR colors, Candy Wave Blue, and appearing straight with no dents (although that's not specifically stated) and the "inside like new." There's an opening bid of $500 plus $33 in shipping to CONUS only. The item is located in Ohio and the auction ends July 19.