I didn’t ask for an inventory car. So it’s possible someone at my delivery location canceled and I was next with that config. This is my 3rd X and 3 weeks from order date is unheard of.
I have a 7-seater on order as well and had a similar experience; ordered around the same day in November and also got assigned a vin within a couple of weeks. My vin was a 421 so I think may have been a cancel or reject, but they did just seem to come out with more 7-seaters in the past week, so maybe some folks ordered before realizing the tax break wouldn't apply to their order.
I put mine on vacation hold and am torn whether to take it or try to wait in case the price drops again before year end (unlikely I suppose to be able to get a 7-seater for <80k, and not sure when they'll let us transfer FUSC again).