Just a quick update: these three items have apparently been pulled by eBay!
However, the seller has some other world gold coins and a couple of USA double eagles up for sale. I don't collect any of these, but I wouldn't be surprised if they weren't also fake -- the Austrian ducats look funny to me, for example. Maybe some of you who are more knowledgeable about these things can check them out? Chances are good that if he has three fakes, there will be more.
Thanks for all who took some time and effort to report these to eBay!