Has extra keycaps from another board, I have almost all the original keycaps that they replaced if you would like to have the genuine originals.
Trackball is missing, but if i recall last time i used it I used my finger to confirm the trackball WOULD work if you had the ball. I was told there is a reddit that deals with finding out what trackball replacement would fit if you don't mind non-oem.
The keyboard otherwise works perfectly fine. Has no issues. Was used as my main keyboard for my vintage setup for a while until I got a black model m.
Has original software and manual, as well as the box. Box is in pretty great shape.
This is a rare Model M and ESPECIALLY rare to have the box. IBM branded ones of these rarely go for sale, and I have never seen one in box before.