Vin:

You only have the valet key, I'd bet. Get a new key from a dealer or independent mechanic (you will need to take the title and registration in, probably). Should be $25 to $30, and may fix the problem.

I'd bet the battery went dead with the car locked, this will activate the alarm when power comes back on and the system has to be reset by locking and unlocking with the master key. The Valet key will not open the trunk or glove box, if I remember right, or the underfloor storage on the wagon.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!