<<<snip>>> 1. This key, which I thought to be a "master key" will not lock
the glove
box. Does anyone know why? <<<snip>>>

What you think is the "master" key is, in fact, what's know as a Valet key.
This being the key you would give to someone parking you vehicle (bus),
rather than the key you use every day.  The idea is that you can put
valuables - camera, radio, tools, marital aids, etc. - into the glove box,
away from prying eyes, lock the box with the ignition key, hand the valet
another key, and they would not have access to the glove box or your
valuables.  'Course, they have access to the bus and rather than just steal
your valuables, they can steal the whole bus, but that's a minor point at
best.

Alan Bosch
& Phred ('88 Wolfsburg)
Rochester, NY

Bumper sticker:  Visualise Whirled Peas