You could go to LELO's website and check if they have the information there, or submit a support ticket asking EF to check it out for you.
I checked LELO's website an did not see any specific information, but I also sent LELO a direct e-mail. I will post again if/when they respond. I have never sent through a product question through the website, I hope they respond!
Though, just reading the review on the product page makes me think that maybe they are real: " Both contour and down feathers are used. Down are the super soft, while contour are the ones with the more rigid quill stem." (from ~LaUr3n~'s review).
In my experience faux feathers generally aren't that detailed or realistic....though this is Lelo, it is possible they are making some really luxe fakes!
Hope they get back to you soon!
[edit: I just realized you could have also been referring to feathers that were naturally molted from a bird, not just fakes. I know people have different levels of comfort with that! Sorry if I'm off on a tangent!]