Or do like I did and build the room around the safe. Won't fit thru the door, of course I did this before I ended up in a wheelchair, not a good thing, both ending up in a chair and fitting thru narrow doors. All the more reason to open the wall back up and install a vault door, easier for me to fit thru and secure to boot. Have to make sure there's an inside release (gotta be) in case my lovely wife decides to detain me for past sins. Another bad thing.
I keep my inventory, serial numbers and such on a couple thumb drives. One I keep with me (has pictures also) and the other I keep at work. KInd of nice in the middle of the day when your missing your cherished possessions, you can pop in the thumbdrive and at least look at the reason that your working in the first place. That and food I guess.