That's very weird. I used the file-checker like you wanted and it clearly showed them all to be down. I don't know what to do in the future then, I don't think I made any mistake now. FF said the files were removed due to content breaking their rules, I think. Did FF re-upload them again then?
I think they're trying to implement a system that blocks files for all but the uploaders if they match a certain hash. But this being FF, they can't get it done right and switch back-and-forth several times now.
It seems you used to share exquisitely rare novels, sometimes old, sometimes modern, in the form of epubs et al. Please... consider sharing them once more. The other uploaders concentrate mostly on pure erotica. I asterisked a few.