I confess that the story of a Disco going to Detroit leaves me, er, dubious. But I was not there nor did see the car or remains of. Why the hell sending such a car to Detroit (the body shape was patented, btw), and then throw them into the river or crush them in any mode??? What does Santa Claus matter here? And not only one car, but "the remaining several bodies"? If "push into the river" is an image, it's just improbable. If it's coined as an authentic story, my mind is made.
Ok, we can have long been unaware of episodes of the Alfa history, but I hardly imagine that, if Discos were shipped to the US, it would have been unremarked by the period press as a minimum.
If there was any aerodynamic test to be carried out, that was possible in Italy or elsewhere in Europe, albeit aeronautical wind tunnels were, at the time, not able to reproduce the ground effect, which is relevant for the Disco aerodinamical troubles.
Instead, I'm aware of a poorly crafted Disco replica in the US. I assume that twoliterlover doesn't refer to that car. If he does, it's time to get lenses! But the detail quoted of the floor pan, assuming the competence of who inspected the car, should support it's more than a replica. Unless the replica was originally made around 1900 gear and engine, and the point is explained.
From the pictures I have of that car (unfortunately I don't find them on my computer right now - they are probably on a CD I have not at hand here), there's no way Touring could ever have crafted such an example, that lacks all the finesse of the genuine design, including a much too flat nose.
The matter has been discussed, as I found, in an early thread
on this BB. I read there that the topic divides Alfa experts. After all, the "intelligence comunity" was divided as well a couple of years ago...
However, referring to Touring and Alfa sources, the only missing car is, as Boudewijn just wrote, the 3-liter #1361.00012 , and this would anyway not fit with 1900-shaped body parts. But yet, that VIN for sure is recorded in Alfa's files, thus assumed to have existed, and no one is able now to tell where it went. I agree with Boudewijn that the most probable case is that it was scrapped at the factory, but there's no hard evidence of this.
Unless one confuses cars that have been patiently described as NON-Discos above in this thread, I fail to have ever counted on a picture more Discos than the official produced number.
Of course, any kind of documentation on that "Zat" Disco is welcome as to let everyone make his own mind on the matter.
But questioning the authenticity of the 13th car out of 12 may trigger lawsuits, I reckon, and it's not my intention...