Were these bare A4000 Rev B desktop PCB boards available at some point in time? I purchased one the other day and this actually might be "rare" as the seller described but I am skeptical. It's a wall hanger (and I'll frame it with a decent presentation) but you guys must know how common these are.
More detailed pics here: http://vintagecomputer.ca/bare-amiga-a4000-desktop-pcb-board-found/
Well they are either surplus or faulty. They represent a point in a process cycle so I am assuming there could have been boxes of these lying around at some stage. The rarity is down to two things really. The first being the number that are in circulation and the second being the number of folk that want to acquire the board. Personally I wouldn't do anything with the board other than place it in a sealed container out of the light. And then look after it. If you are unable to do that then I would be more than happy to look after it for you.
Having a mint board just has to be valuable. The trick now is not to damage it. Please don't damage it.
As to value, well that can only enhance as time goes on.
One of the most common items that I get asked for is my unused, still in its original box, Amiga 4000T case [Escom]. No motherboard just the case mint. And I bought that for a couple of quid off Ebay.
Look after the board. And well done. And wow am I jealous.