I have an XBOX Debug kit - the REAL debug kit with 128mb and Debug MCPX so it runs the original Microsoft Debug BIOS and XDK dash etc.
Its in a black XBOX case and I also have an extra spare motherboard for it.
This kit was used to develop ConfigMagic and my TATX Debug Dual BIOS with as well as bunch of XBOX Linux stuff.
I have not developed XBOX1 stuff in 5 years, so its collecting dust, let me know if you are interested.
(I purposely did not list this in FS forum, as Devs would appreciate this much more)