Like I said, long tap on one of the epub search results and check what exactly it says at "Path:" on bottom.
And of course there is just one metadata.calibre file in mnt/us (you can't have two in the same directory). But you might have another one somewhere else, and the EPUBs might be in that one, and if SEARCH_LIBRARY_PATH2 does not point to that directory anymore the EPUBs cnnot be found at all.
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