It shows I have 398 in my account under dictionaries and guides.
I don't see them on my kindles though. Even if I am on all. And that is probably because they are buried among the 3000 books I have in my cloud. I think what I have done in the past after an update, I take them and put them in my "read" folder. One of them. I have 2 now as the first one got too big. Since I always display the "read" folder, no matter if I use "ALL" or "downloaded", I don't see them.