I have a great, industrial grade lock box for sale by Tufloc.
The lock box has four individual boxes, which have their separate working keys.
There box is made of very high gauge steel and has mounting holes throughout the box which would allow you to mount it in a cabinet, closet, desk or within another safe.
The lock box is in mint and near new condition and has never been used.
Each box has a piece of industrial grade black carpet on the bottom of each box.
A comparable box by Tufloc (which is smaller) is listed at $440 before shipping:
https://www.tufloc.com/product/lockboxes-2/
This would be great for the workplace, for ammunition or handguns, etc.
Dimensions of the lock box in total is:
16.25 inches wide
16.25 inches deep
11.25 inches tall