My salesman told me the cars built early the beginning of the week usually get shipped out before those late from the previous week. I guess something like last weeks getting parked after shipping is over for the week, then new ones put in front of it, then taken away to get shipped.
So mine, which was finished Friday night (29144) may be shipped after yours!
But then again, thats the word from a car salesman, so who knows really.
