Even in the movie "Gone in 60 Seconds featuring Nicolas Cage, there is dialog there regarding obtaining MB keys so they can fill their MB orders...so it's probably common knowledge among the pros that you can't steal an MB w/o a key.

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car