Here is a 910 from the '53 and '58 catalogs, and you can clearly see the decal.
Now, that particular model, the 904, is not listed in those catalogs, and as far as I can tell, no boxes/sets are listed in the '49 catalog, but it is listed in the '41 cat, albeit with a different decal:

So, that leads me at least to date the box at 50-52. And they do list bit accessories in the '49 catalog, such as countersinks, dowl sharpeners, etc. Not too far of a jump to selling bits at that point. Again, they don't list any boxes in that catalog, possibly a result of the war.
And I know that you covered all of that in your post, but I thought pics would help some others. And until we see a catalog from those years, we can only speculate what would have been!