FWIW, for me, the 1/2-inch drive sets that pop up with all NB pieces and unbranded Plomb WF series ratchets actually lend more credibility to the theory than additional examples of 1/4-inch drive sets with unbranded Plomb WF ratchets, regardless of the catalogs. Because (a) I am still not completely sold that the catalog image of the midget rat in question is a Plomb, and (b) whether the 'use wartime surplus until obsolete' approach originated with Sears, Roebuck & Co or Plomb, there is no good reason why the idea would've been only confined to one drive size.
EDIT: To be fair, and completely objective, it is a can of worms that keeps opening wider and wider, because it does make me wonder why, by the same token and theory, we don't see sets that are brand-mixed further than just ratchets. While Plomb, like most mfgrs, sold pieces (sockets, handles, extensions, etc) individually and in sets, I find it problematic that they would've been left with that much more surplus of ratchets than, say, flex heads, for example, or extensions, etc. The production I think would've been relatively balanced. But we don't seem to find an unmarked Plomb WF series flex head or an unmarked Plomb WF series extension in Craftsman sets loaded up with mainly NB BE or Circle-H pieces with the same frequency - if at all.
Just thinking out loud, obviously.