Are the missing items listed in the Library in the Other section? Are they visible (and playable) in Infuse when browsing via folders?
Also, you can enable the ‘Prefer Embedded Artwork’ setting which would use artwork embedded in the files (if present). However, Infuse uses different artwork for posters, fanart, and logos…so depending on what your files have inside Infuse may still need to fetch some images from TMDB.
Before I went to bed, I removed and re-added the share and it found them after that. I’m not sure if they were in Others.
It went through and found most everything overnight, but there are a number of TV shows that were not in Other before. The first scan I did, I think 2 days ago, left very few items in Other. Now, for instance, Bewitched is in Other. And, for some reason, even though all the files for all the episodes use the same naming convention I use on everything else, it orders them with S4 listed first. All the seasons are there, but S4 through the last episode are in order, then it jumps to listing the early ones.