@drMerry - I don't know what you mean by this gaps/missing books thing. They are *gaps* in your series index, it is nothing to do with whether you have book formats on empty books or not. If you have book entries for 1,3,6 only, it will tell you the gaps are 2,4,5. If you have 1,3,6 with book formats and an empty book entry for 2, it will tell you that 4,5 are gaps. Whether a book entry does or does not have a format is irrelevant.
If you want to see what books in a series you don't have that exist in your calibre library, you would just do a search for formats:false.
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