I think I already said it in an earlier post but
WOTC does have 2-3 people who scour ebay looking for auctions that are peddling illegal copyright materials. That adv guild module lot easily could have been taken off of ebay but I didn't tip them off or let them know since I had some requests from other collectors to let the auction stay so they can find out how much AG items go for. Another seller of AG last year got in trouble by
WOTC for selling authentic AG modules.
WOTC has made it clear that retailers are not allowed to sell AG modules