Off topic: I have a small 2 drawer size file cabinet. Bought used years ago, no makers name, always seemed heavy. I was moving it around today and took the drawers out to lighten it.
I found out is has a steel plate in the back wall. Plate is about 11x16 inches and 1/2 inch thick, so about 25 pounds. Looks like matching factory paint job. No way to remove it.
Why?
It has a key lock. Which came locked and does not do anything. Top two drawers are file card height but no dividers. No extra holes where a lamp or such would be mounted and need ballast. I would expect ballast on the bottom not standing on end.
It is not a fire proof cabinet. I suppose x-ray shielding but it is barely as wide as the drawer and no extra width.
Bill D