If you remember the movie, they referred to the Merc keys as both "laser cut keys" and "laser cut transponder keys"
The important part of the description is "transponder". The transponder is the only part of the key that is an theft protectant.
There is a receiver that must receive an exact signal from the corresponding transponder key to start the car.
I don't believe being laser cut is an theft deterrant. A key works by pushing against springs on the inside of the lock. This method itself allows for some error. Making laser cut keys would not be any different than having them machine cut, forged, filed with sandpaper or latino cut...
As long as the pins are pushed up in the lock, the key will turn. I think the laser cut feature is a gimmick.
Our cars have the transponder keys and corresponding receivers.
If I am wrong, someone please learn me.