No guarantee the box and gear are the same brand, and the way the box seems to have been shimmed and shoehorned on says probably not. I suggest you invest some time in getting it out of the shed and into sunlight to look very carefully for any lettering on the box. You might get lucky and find clues as you disassemble. Also entirely possible the box was homemade or fabbed up in a blacksmith shop.

Push-comes-to-shove, I'd try to identify the gear and paint the box accordingly. Who's gonna prove you're wrong?