Looks like if you used the "Send to Kindle" option to get files to your Kindle prior to April 14, 2016, it stored the files in the Amazon Drive. So, I have a couple items there from that. After April 14, 2016, it only saves them in your Kindle Library.
I also have a folder called "Archived Music" that appears to be several things I purchased from Amazon once upon a time (more than 10 years ago.)
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