Ah, it hadn't occurred to me that the OP was referring to the LIST of content, rather than the content of a specific book
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Yes, Murray is right. When you download a sample, that just goes to the device that you request it on. The "archive" is a list of all the content you've bought from Amazon which is NOT currently loaded onto the current reading device. When you download the book, it will disappear from the archive; if you delete it, it will reappear in the archive.