Find on of the books you're not seeing in Windows Explorer. Then, in the detail pane (show it by selecting the book icon in the status bar at the bottom right). Click on "Click to open" by the word path. This will open Windows Explorer to the location of the book. I just want to double check you're looking in the correct place. Often time there is a space or a . or something that puts the book into a folder you don't expect.
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