Door locks - locking and unlocking with a key
Vehicles with a trunk protection system
master key
Additional key
The master key fits any lock. The additional key cannot open the trunk lid.
Therefore, to protect items locked in the trunk, leave only the extra key to the parking attendant after you have parked your car and left it.
Since the doors and trunk lid can be locked without a key, you should always carry a spare master key with you in case you forget the key in the car.