@WizkidTX - some (many) Windows/OSX/Linux ebook viewer programs write to the format files, including the calibre's ebook-viewer, they write things like last position, bookmarks, annotations etc.
Maybe you could keep Status:finished and Status:unfinished books in separate Virtual Libraries, and/or make use of the Column Colouring and/or Column Icon features in Preferences->Look and Feel to highlight Status:finished books
BR
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