I'm very sorry to read this post. I hope you are able to find them and get some satisfaction for your friend. I wish I still had some old Star Wars toys to donate.
I was almost ripped off myself recently - $245.00 worth but the seller came though with almost everything eventually after many excuses. Last time I'll ever pay by check. He still owes me a Retro Chekov or refund but has stopped answering email and changed his ebay id. Good thing I got myself a Chekov separately.
Again good luck in tracking him down. As someone who lives in Vermont we aren't all crooks.
He who dies with the most toys wins!
Original Mego Museum Postcard