If you have the locking glovebox handle option, you can dis-assemble the lock cylinder from the handle assembly and determine the key code stamped on the lock cylinder. If both locks (the trunk and glovebox) are original to the car, they would have the same key code. I can cut you a key to the code and you could try it out.
Regards,
FlatHeadCoupe
John McClure
919-559-5774