Good news guys - I found the master key:
We've peeled a few other barrel locks off stuff at work before - I've yet to see a barrel lock that can last more than one minute in a match with a 9x rivet hammer... I'm pretty tempted to send the whole mess back to GunVault with a nice love letter. What do ya think?
I'll pull apart the electronic lock assembly to confirm that it was indeed the same problem that resulted in my electronic lock being disabled again...