I don't know, the boxes, pre-war at least, were pretty par for the course, and the big invention in other top boxes post war was the six-drawer layout, which, in my opinion, isn't that impressive. They seemed to keep pace with Blackhawk after the war for "things that didn't work out" and they were one of the few, if not only for a while, that roller slides on the boxes. And it isn't like Snap-on was making its own boxes, either; they were made by MBC, among others.
I think we are all looking at the field with modern 20/20 vision, skipping past a lot of little remembered facts and only looking at the final answers, not all of the questions.