Nice thread. Nothing new to add to your lists, but I did want to point out (or re-point, as it was mentioned earlier in the thread), that because the various E92 images were used in multiple other sets, the blank back cards on your list probably can never be conclusively identified as belonging to one of the E92 group of sets.
Even if you discount the E105 Mello Mints as being the source of the blanks, due to their thinness of paper, there are still the E90-1, E101, E102, and E106 cards that share the same images as what is seen on your blank backs list. Each subject on the list has between 1 to 4 possible other sets that the blank back could be from, and this doesn't include the D303 sets (not sure of their thickness) nor the T216's (which I believe at least some are thin).
Always appreciate a research thread like this one...keep the nose to the grindstone!
Brian
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