Re: 1, you may have a copy of your notes in your "My Clippings" file, which is just a text file, and not associated with the actual book and its notes. Unfortunately, the location numbers will not match the updated book, probably. You could try looking close to the old location numbers, in the revised copy, and try and re-enter the notes, if they are important to you.
If a book is updated, the locations change, and then the notes, etc. would not correlate to the revised copy of the book. That's why your old notes would have to go away.
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