OPTIONAL: I plan to get a piece of rubbery waffle shelf liner and trim it to size, then glue it to the bottom of this box to help keep it from sliding off the table. When I do, I'll take photos and update this post.
You can read about my Dad's miraculous WW2 adventure here: How a WW2 Twist of Fate Saved my Dad
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).