The fact f the matter is, eBay just make it up as they go along.
They are also unfair towards sellers.
I just use eBay now to purchase from the shops on there, I don't sell any more and i don't like to buy from private sellers.
I too used to sell laptops on there which i refurbished myself. You can't get rich doing it by any stretch of the imagination but it was steady money as i was constantly buying and selling them. I usually had a stock of over 50 in at any time.
One i sold was supposedly a birthday present for the buyers son. I sent it and heard noting more, then 3 weeks later, i had a message saying that she had given it to her son and it didn't work. I asked her to send it back to me and i would investigate (it was quite an expensive laptop) Instead, she opened up a dispute. eBay ordered me to give her a refund and her to send it back to me.
eBay then said i should give her the refund once i have received the laptop back but she had a certain time to send it back in.
A week later, i had a message from eBay telling me that as she hadn't provided them with any tracking info, i had won the case and no longer needed to give the refund.
Next day, the laptop turned up. I opened it and decided that i would refund her privately as a gesture of good will because she had sent the item back. I tested the laptop and there was nothing wrong with it which annoyed me because of all the grief of it all.
I ended up not refunding her because she enclosed a nasty letter with the laptop so i thought 'screw you'
Bottom line, keep perusing in case there is a genuine reason for no response but don't hold out too much hope, he doesn't have to send you the item after all.
Ben