Obsolete cover image shown as icon in Kindle viewer

I have Scrivener 3 and have compiled my ebook (.mobi). When I import it to Kindle viewer app, it shows the old original cover as its icon, although I thought I had long since deleted that file and have a new cover. From where does it pick up that old image? How can I replace it with the current cover image?

Here is a previous discussion on that with some fixes provided.

Thanks, Amber. I was able to get rid of that pesky old cover by deleting
~/Library/Containers/com.amazon.Kindle