How were you able to put it into autopilot? Typically, the autopilot is calibrating itself the first 60 or so miles of driving, and it does not let you engage it.
It's entirely possible it had more miles than 5 on the odometer when I picked it up. Officially the paperwork says 15, the associate who gave me the car said it was actually less, and the odometer isn't very prominent so I never even looked. Maybe it had 50 miles and was a reject ;). I should go check TeslaFi, since I reenabled that the day I bought the car. I confess that the only way I ever know how many miles my car has is when I see it on TeslaFi.