Well he is shipping from Bangkok, Thailand - which makes usps kind of hard to use. :confused
I just can't assume everything is recast, I have never seen any complaints about this mask being cast or recast-nor seen anyone talk about any goblin mask origin.
I think all you can realisticly expect people to do is watch out and avoid those people who have a history of recasting -and pay attention to boards like these whee things are recast are pointed out. If no one is complainging about an item or a seller - I can't see it's the buyer who has to go out of there way investigating. I buy stuff in the JY all the time here, I don't track town each item - I just can't assume everyone is "bad".
My guess is that someone "recast" one of these (or more) from a studio mold years ago and every vesion we have seen since using that copy - they sure all look identical - in which cast they are all true recasts (although people don't care about that - just if fans made it:confused )
I say if you like it, and no one here has any idea that it is a recast fan made item, then bid on it.