PDIs miss loads of stuff. I got a new Polo back in 1999, Diamond black. There was a perfect straight crease in the wheel arch, as if it had been erroneously pressed at the factory, with a perfect paint finish on top. I went back to the dealership and they agreed that it must've been done at the factory and missed by PDI. They resprayed it 3 times once getting the crease out, but I could always see the resprayed area. In hindsight I should've rejected it. But I was naive back then.
Most of these issues are discovered the first time the buyer washes their car.
Big advantage in collecting a Tesla three months or so after the first batch arrived here was that the fact they don't PDI the cars and that defects were pretty commonly discussed on the Tesla Motors forum. Meant that I went to pick mine up knowing I'd need to check it carefully for defects. Needn't have worried, the paint chips and scuffs were so bad I could see them from the other side of the collection area . . .
Obviously the car has been hit, the question is where?
Even though you said you requested that they didn't give it a clean and polish, they must have done something to it after taking off the protective covering. The minimum would be a wash. You spot everything when you wash a car.
The obvious thing to me, it was done while parked at the dealers.
You never know what might've happened to your new car on the way to the dealers. I found out at almost 3 years old that at least 1 of the Pretoria wheels on my Golf R had been refinished. My wife scraped one of the wheels, and when I went for a refurb (powder coating), the refurber showed me that it had been repaired (cross section of 5 paint layers instead of the expected 3 layers - they hadn't stripped the old paint). It had never been out of my hands for more than 1/2 a day for servicing - not enough time for a powder coat and cure. Must've been done prior to when I bought it new.
That tiny scuff on a corner looks to me like the rear bumper has been off (or its a replacement one) and the bumper has been briefly dragged on the floor on that very corner before being fitted/refitted - there's directlional scraping down to the black plastic core.
We rented our college car paint facility to the local vag dealer one summer, we had a car park full of damaged brand new vw and audi cars, from wee scuffs like this to huge holes punched in the qtr panels, all "fixed" prior to delivery to the customer. Dozens and dozens of them, I could not believe how many needed work.