I think the MBP file is NOT deleted -- they expect that you will later want to import that book again from Kindle's backup library, and will still need those files.
Also, do you regularly go to the content manger and move your books to it from the Kindle memory? Everything initially goes only into the Kindle memory -- and it is up to you to move it to the memory card.
I have over 450 books on my Kindle, have imported books from many sources including my own on-line library on my computer's hard drive, and have never seen that problem.
Charles Wilkes, San Jose, Calif.
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