Well, this is rather fascinating: an Amiga 3000+ prototype board was sold on eBay by none other than Dave Haynie. It fetched a decent $2,155 USD and included a couple of his notebooks from the period when he was working on it.
As if the fact that such a board still exists isn't interesting enough, he penned a long description of the board and what was going on at Commodore at the time. Unsurprisingly it is yet another exampe of Mehdi Ali and his crew destroying what chance Commodore had of actually making a success of the Amiga line.
Sadly the photos seem to be gone (not sure if that's how eBay works once an auction has ended), especially since it sounds like one of the notebook covers was rather amusing.