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I don't have a Kobo, so I'm doing what I hope is educated guesswork. I've been read on this site that the free 100 books are only remove with some difficulty, especially for novices. I think that means they are stored in a different way and a different place on your Kobo. I would suggest disconnecting your Kobo from your computer, following the (Kobo) manufacturer's instructions, and having a look at the content on you reader.
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