Here is the thing though. Japan USUALLY trashes older dev units and source code due to how little livable space that mostly mountainous country has. So this thing is pretty rare, unless most of them got scooped up by former devs. Western countries save dev boxes and source code because we don't have the space issue that Japan has. They really have like under 20% of the landmass livable, we have much more land available. Not Japan, they have too much of a premium on space, that even cars over 25 years old get completely destroyed. No more 90's Supra's and Skyline's they force people to keep them off the road in garages or they get destroyed.
That being said, this devkit is in IMMACULATE condition! Really something to behold. Is there a buy it now option or no? I don't speak or read Kanji, I only know about 50 words.