Ok, so it's confirmed, there's at least one duplicate AppleNet, this one is a 2/10 that had MacWorks with Minifinder on the widget that I got off ebay ~August 2018. The previous owner got it from an estate sale; it had files indicating a family on Long Island owned it in the mid-late 1980s - this is the one that had that copy of Lotus Jazz on it.
But if there really are 10x more Lisas than the 13K, there should be a lot more duplicate AppleNets, and we don't see that. However, since there is one black swan, there could be more. The big issue then is how many?
So the serial numbers aren't sequential but likely unique and the AppleNets are supposedly sequential, but now we find they're not unique. Ow!
WTF was apple (not) thinking!