Vintage large Metal Box w/ handles,Fire resistant

Description

Acquired this at an estate sale (ahem.. several years ago) from what I assumed was prior military since there was a lot of military 'stuff' there.
This is a metal lockable box in gray metal.  Heavy.  Handles on both ends, chain on the inside holds the lid open but the chain on one side has come off (needs a new screw).  Cork in the edges of the lid presumably to help keep the contents waterfree but I haven't tested it.
Lock on top BUT THERE IS
NO KEY
. It's my understanding that your local lockshop can make a new key.  There are scuff marks, small rust spots and some edge wear.  Photos of all sides.  Original owners social etched into the side but I've smudged that out in the photos.
Measures 14" wide, 9.25" front to back and 6" tall.  Thick 1/3" walls. No apparent maker's marks. Could be used to store documents or ammo for your bug out.  Hefty at 13lbs before packing.