Copart sells cars for insurance companies. It’s basically a junkyard. There is a ton of corruption there. There’s a reason they are selling it. I would take the bus every day before I would buy a car from them!
You have a better chance of winning Powerball than getting a good deal on a car there.
Copart appears to have many lots across the country. My only dealing with them was when I donated my 2000 BMW 323i to Habitat for Humanity. Copart was the actual company that arranged pickup of the car and handled the paperwork.
For a "salvage" Model 3, that appears to have arrived at the Copart lot able to drive under its own power, I'd guess that something happened to the underside of the car (the only photos we don't have access to). It could have been dropped off a transporter or lift. Major suspension work might be needed. Or maybe one of the motors is damaged. Either way, I would only buy it to part it out.
The old motto: "If sounds to good to be true it probably is." definitely applies to used cars. Can you afford to be out 15 grand? If you can you can probably afford to buy a Tesla from more reliable source or new even.