GM cars usually had two keys, one for ignition and doors, and the other for trunk and glovebox. I drove lots of Chevys and always wondered about the inconvenient distinction.
One of those auto dealer training films explained the reason. In cities where every parking lot had attendants or valets, you could leave the ignition/door key with the valet and keep the trunk/glovebox key. The attendant could park and lock the car but couldn’t (easily) steal the contents of your trunk and glovebox.
Polistra's Mill 