E53 = 2 remotes and one plastic valet good for about 5-10 lock/unlock cycles
E70 = 2 remotes unlock/lock and drive (Master), and 2 for door Lock/Unlock metal keys imbedded in the remotes. The keys will lock the glovebox but will not start the engine.

If you go somewhere, you can lock your valuable in the glove box, give the remote to the valet and keep the embedded key. The car is Lockable/unlockable and drivable but NO access to glove box.