The broker who sold the Gen2 Stunticons recently on ebay (z75sales) is apparently the person posting up a couple of videos that document the estate of a former Hasbro/Kenner employee. (same username on youtube)

The first video is just a minute of looking at rooms of boxes, but the second one is interesting, for showing us how he stumbled across a pre-production sample of the Beast Wars Optimal Optimus toy, in mostly black. (you can mute the videos as there is just music playing, with text on the screen)

Hopefully he posts up more videos of the rare stuff and prototypes (not just Transformers). Even though he has mentioned in the past that there wasn't too much in the boxes that was Transformers (I think he's already listed all the non-Beast Wars TFs on ebay), there may yet be some Beast Wars goodies to be shown off.