Not that it means much, but I saw a semi trailer full of new Model 3 on I-80 heading east near Des Moines Iowa today. All of them were black and still had factory wrap on the panels.
The front ends were covered by plastic wrap but I am certain they were Model 3 by the shape of the headlights and the overall length of the car. I regret that I didn't get a picture.
I assume they are press cars.
That is quite interesting. I didn't think they made anywhere near that many beta Model 3s to be shipping them like that.