Im sure you are aware of this, but just because a car has a clean carfax does not mean it wasnt in an accident.... All sorts of body shops dont report to carfax, and if (for example) a car fell off a truck or suffered significant damage before reaching a service center, and then tesla fixes it, that also will not show up on a carfax. I dont think carfax is going to help you much in this case.
If this was a traditional dealership type model you could get a pre purchase inspection (third party) to look into it, but I dont think thats possible with a tesla.
Also, OP, since you marked "disagree" on my post I would love to know what you disagree with in it. The fact that purchasing such a car is not for me, but I understand why its right for others? The fact that there is definitely "some reason" that these cars are discounted?