I made a pretty decent lockbox using the lock studs that I found in the below link. I realize that a person with some tools can hack or bang away until they open it, but they will have to work at it and they will be heard. It cost me less than $20 for the two stud lock kits and I have several unused ammo boxes of various calibers in my storage room.
https://www.amazon.com/gp/product/B018EYU5HQ/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B018EYU5HQ/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
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