Off the top of my head, the only part that makes me pause is the 2 single digit examples at the top (so those will only be 6 digit numbers, presumably), and the lump of "US Made" as a category. So far all US made items have been traditional (non-scale) rolling stock, right? (maybe I missed an example of otherwise, but that seems to be the general idea). Oh, and "Miscellany".
I wonder which category is club issued items? Miscellany, General Exclusives, or just lump them in with whatever category they fit?
With some categories possibly overlapping, this could become meaningless after a while, but I guess we will see.
The first 2 categories on the list will not be 6 digit numbers. There's a leading zero, as in 01 and 07. Look at the SKU's on these items:
Club issues are in category 01, Exclusives.