I see on the ebay page people are wanting proof, which he can't really give, except to contact other people. Sure as heck if you contact the historical museum and it is indeed what he claims it is, then Curt will more than likely bid, and anyone else can forget winning it. lol
The Falcon040 motherboard is also not very wide on the connector side, it's only about 2 sims long, if you look at the sim slot that runs parallel to the ports. So the slot on the back for the ports would be unusually long, as it runs the full length of the case.
Since it has no Atari logo I'd give about $2 for it seeing how there's not even a PSU fitted. Imagine someone visiting and you go, hey look, I got a Falcon040 prototype case, you know exactly what the reaction will be... yeah right, where's the logo? haha Then try to prove it.
I have a Atari license plate frame, which Curt verified is rather rare, but it has the Atari logo and name on it, plus "Power without the price", so there is no guess work.