Yeah I did wonder if this was the case - small community, achievable number of games, all collectors pretty much satisfied apart from the oddities that don't make it to eBay often anyway.
You have a complete CIB set? Or you still chasing some? Personally I'm aiming at just carts, for reasons of space and my mental health, but boxes seem very common for a machine of this age. Already got 3, and a couple of carts that came with a bonus manual. Which is kind of why I asked this in the first place, seems like a cheap way to get a shelf full of retro cardboard.
Only CIBs I am missing are The Bit Corp Originals of which I have only seen NIAD with 3 not sure if 4th exists , (I have the repos from Collectorvision for them though) , and I only have 2 CIB of the 6 Xonox Double enders. I say six because the Europe and the Canadian versions are so different that I wanted all of them. I have one European one and one Canadian one.
Skiing and Amazing Bumpman from Telegames didn't come in boxes but I have the original plastic with stapled hanging cardboard that they came in.