I lowkey forgot to post these when I got them but this thread didn’t even exist back then. But I was able to demo a 4020 cabinet and a couple MAPNET devices out of a school that was being upgraded in my district.
I did not get the internals of the 4020 (I think JCI took it with them) but I do have all the original documentation that went with the panel, including the original bill of materials and receipt of installation testing, which is pretty neat. Cabinet now holds my Rev 9.02.02 4020 and all of its expansion cards.
(cat was not included in the materials I got)