After your question about options, I got to thinking; and I attached my kindle DX to USB to look at documents folder file names -- they too now contain the ASIN# in the name for Amazon-acquired books.
Also I noticed in the root of the kindle device a file called "metdata.calibre". What is this?
In the system folder there are two interesting files: "userannotlog" and (of more interest to you I'm sure) "collections.json"
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