As an anecdote: On Wednesday night of last week, I found a seller looking to seller their M3LR reservation for delivery in FL. The car was already within the delivery window and was waiting for him to schedule a delivery appointment for between Thursday & Saturday. I am located in MA with an NJ DL. After not getting through to anyone over the phone, I went into a local Tesla Showroom on Thursday (not a center but just mall showroom) and asked them to switch the reg details on the reservation. He switched it to my NJ info. Myself & the seller both assumed the VIN would get re-assigned as the FL delivery center told him the car was already there and was waiting for appointment scheduling. The VIN never got reassigned and a day later I got a notification about choosing a Delivery date in NJ. I picked the car up today in NJ and just drove it up to Boston (1 week and 1 day later from changing the reg. info) with no hiccups at delivery or anything. Certainly can still be done and can be done out of state as well