Hi John,
I very much doubt that there is a hidden lock for your glove box, but anything is possible. If you have the keys for the ignition, petrol cap and doors, the only other thing I can think of is that you have a foot locker, but I am sure you will have noticed that.
Possibly the previous owner had some sort of lock for securing his luggage to the rack?
I have a cup full of keys at home I don't know what any of them are for but I can't bring myself to throw them away.
Peter
