FWIW, the same thing happened with the delivery of my '07 X5 in September. It arrived several days later than it was supposed to and even the dealer could not "find it" during the 2-3 day interval. Kind of a mystery....

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BMWs: 2007 X5 3.0
2002 330xi
1991 525i (ret'd)
1985 325e (ret'd)