eBay only cares if a big enough company complains - even if the company is full of crap.
If a verified movie studio filed a complaint about someone selling fake copyrighted posters, it would be down in a heartbeat.
They do this all the time, especially for things like computer software, claiming that it's not legit. eBay doesn't even try to verify, they just pull the listing.
But if you or I try to let them know, they couldn't give two sh*ts.
Caveat emptor.
On a side note, I sent a message to the seller as well. Never heard anything back...