 , IF you felt the need to lock a cabinet built of 1" thick nominal lumber (aka 1x pine from home depot, to make it "forgiving" in the event of a fire, I would use a light finish nail on the non opening sections. This way you can slow the fire and heat transmission, but IF it blew, the explosion would be less than even a refrigerator. Goal is to stay away from any metal container... no?
The refrigerator idea.... with a golden rod heater installed.... is my next "stealth gunsafe." Can't wait for the Mrs. Freezer to fail!!! It's right next to my big safe!
Da 
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"You have never lived, until you have almost died. And for those who fight for it, life has a flavor that the protected will never know." Guy de Maupassant, 1893.
Anonymously, penned on a sign at a command post at Khe Sanh, RVN.
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