I took a chance on this auction - offered $15 and the seller agreed. Package arrived yesterday - confirmed most keys weren't working. Auction stated that it would 'power on' but does not work.

As you can see from the auction images, it was pretty dirty but complete. I found that while about 20% of the keys responded, there was definitely something wrong. I took it apart, cleaned it up and reseated the connections. Behold, everything works perfectly. Turns out the mylar sheet had come out of the sockets (most likely due to the plastic heat welds (rivets) breaking apart).
Here it is all cleaned up and working - there is very little wear on the keys - definitely happy with my purchase!
