Leatherworker Scammed Me

Today I was linked leatherworking. I provided mats for:

Footpads of Impending Death

12 x Nerubian Chitin
8 x Arctic Fur
10 x Eternal Shadow
5 x Primordial Saronite

Once traded he idled for a min, and then logged out never to return. Is there anything that can be done (like having my mats restored or something)? I saved for quite a while to get those mats. Any help is appreciated.

PS: I'm not sure how to link an image here, but I have one uploaded here of him offline and speaking with others about the scam.

You should report them to a GM as explained over here.

Done. Is there any hope of getting my mats restored?

Unfortunately we don't restore items