Yes!!!!
At one time I worked for a General Motors company. While you were looked at strangely, (since you got a good discount on GM cars), or in some cases UAW people would vandalize your non-GM car in the company lot in day light, if you had a non-GM car in many cases the test garage would have you pull it in for a free oil change or brake job, etc. They would not do a complete tare-down, but sure would inspect and document everything they could.
In one case locL sports star had rare non-US luxury car. Someone got him to drive it into theist garage as part of a visit so he could sign pictures and do press stuff with the staff. He knew what they were doing to his car, but to someone outside, everything looked legit.
At one time I had to visit some folks at the GM proving grounds. I parked next to something that had all kinds lumps and bumps Velcored to the outside of it. I asked and they said, of that the brand new XYZ car, and the press and others sit outside the fence with a long lens and try to get pictures of the new designs. So they change the shape of it all the time to hide the final look. Hey, you want to go out to lunch in the Bently? They had all kinds of cars tucked away that if they were back together and not part of some test, just grab the keys and go. Most of them were acquired thru close relatives of GM employees. Here is the cash, go have you mother buy X and enjoy it for 6 months, then it would get sold to some holing company and mom would get also get a great deal on GM car to replace it.
I heard it was not just GM, but all the American car companies did it, but kept it quiet. It was shock when car companies from Japan would just take detailed pictures and pull out measuring devices on cars at the big shows. They figured you are doing to us, we do to you, why waste time hiding it. The American companies got all worked up and had the people from the Japanese companies tossed out of car shows.