I went through the process of adding a new book with a mobi-asin. I had the file explorer open to the thumbnails directory and I did see that Calibre sent the thumbnail file to that location, appropriately named, i.e. with the ASIN id instead of that seemingly random ID.
However, as soon as I open the kindle after transferring the book, it seems that the kindle downloads the cover art despite the thumbnail existing there, and thus overwrites the correct thumbnail that Calibre sent. If I then re-send the book using Calibre, thereby overwriting the kindle-downloaded cover with the correct cover, it does show the correct cover for a split second and then the kindle re-downloads the cover and overwrites it again.
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