I actually bid on a motherboard he had for sale on ebay, and unfortunately I didn't read through the whole auction description. Anyway, it turned out I won the motherboard, and I looked the auction over, and stumbled across the words "Ohne funktionsgarantie" which means without guarantee of it working or something similar. I started to dig into his feedback, and saw his negative feedback, which looks like things he is selling "ohne funktionsgarantie" means more or less defective.
I took the discussion up with him, and he started with some vague reasons, like he had also sold items "ohne funktionsgarantie" which were working fine. All he could dig up was some auctions ending at around 15-20 USD, so nothing most people would cry about. I was amazed by some of the auctions he got a negative feedback on, as it was a zorro card, and he claimed that his A4000 didn't have zorro slots at the time of testing, becuase he had switched to PCI (no A4k pci solution is without zorro slots). As I asked, he said that he only had an A2k at the time of the auction; again very questionable. And finally, the same time the a4k motherboard I bid on, he had a z2 scsi controller for sale, which he surprisingly had have the time to test. In the end, all of this doesn't make any sense to me, so I decided to accept the negative feedback I might get, and save my 150 USD the auction would have set me back. Unfortunately another user will most likely end up with the dead motherboard :-(
Bottom line and sorry to say it, I cought him lying enough times through the emails sent back and forth, that I would ever trust him.