They didn't leave the 'key' in the glove box? Center console storage area? Pocket storage area in between and just behind the front seats? Cargo nets behind the driver's seat? under the seats?

If the alignment is WAY off and the dealer is crap for being able to fix it... take it to a reputable Mercedes Dealership or Repair shop that does SLK suspension work. I'm sure they could sort it out in short order.

Good luck!