3 Keyes
Xli 2005
The metal one is used for wallet parking at hotels when you hand over your car in the porch to the hotel staff to take it to wallet parking and when you are leaving the hotel an announcement is made on PA system in the parking lot and the hotel staff brings your car to hotel porch.
Now the trick is that if you lock the trunk with the master key, it cannot be opened from the cabin lever or the metal key (for wallet parking) and you can keep valuables in the trunk. When you get back the car, you can open the trunk with the master key and then it can also be opened again from cabin lever.