Welcome to the forums!
I think there are lots of people who would love to have that 386 system. Collectors use them for a variety of things such as running vintage games, testing software compatibility, interfacing with other earlier vintage hardware, the challenge of writing some program on a more limited CPU, exploring computing history by trying it first hand, using parts to repair existing machines, as a movie prop (because green screens are retro), for a personal museum, and so on.
Personally, I would try to keep the keyboard out of the hands of the "keyboard kids" on eBay. Of course, not all keyboards are worth that much, it depends on the key switches.
Is the ZCM-1492 a green screen MDA monitor? These days those are certainly desirable. What all is installed in this system? I'm not aware that there is anything special about this particular CPU model, but if it is in good physical condition (no major rusting or yellowing) then it would probably get a good amount of attention.
Note that you can offer the system for sale on this forum. People here won't pay the absurd (and often fake) prices things seem to sell for on eBay, but you won't have to worry about eBay fees, and if you can find a local buyer you may not even have to worry about shipping.