Need some help on this one, US M-1938 Dispatch (map) case

[Aragorn243]

I don't think no lift the dot markings means anything either way. Most of these that I was able to find online did not have any LTD markings. Only one manufacturer did and these were all khaki. LTD markings are missing from many WWII era items. The no verdigris is significant but does it take moisture for this to develop? This thing is mint. No marks, no stains, nothing. Another concern is these came with a piece of plastic laid out in squares. Pretty sure this is missing in this one but not positive as I didn't examine the inside closely and not sure where it goes. It did not seem "stiff" however when I was handling it.

Others say you have to smell it and if it smells like old canvas, it's good but that seems pretty subjective and not very conclusive. I did not smell it while I was there. This is one of those places that there is zero cell service inside and I had to be outside and far away in the parking lot before I could get service again.