Did they deliver to your home or did you pickup at the dealer? If they delivered to you, the mileage seems reasonable and the driver could have connected their phone. Honestly, 66 miles is pretty typical for most new cars (maybe not Tesla), since many are getting test drives from the dealership lot. If the car looks great, I wouldn't worry about it.
The members on this forum totally freaked me out on my recent MY delivery, I was certain I would get scammed by Tesla with a lemon. In reality, my Austin build is flawless and I'm very happy. It was delivered with 50 miles on it (because it was driven to my house).