Amazon does not seem to be returning any metadata results at the moment, including covers, so if the book is only on Amazon (or it's searching on an ASIN as an identifier) you will get no results. I keep forgetting to open a query about this issue, but I suspect Amazon is tightening up their API again.
If deleting the ASIN doesn't help in returning results from other sources, you can get one manually from Amazon as follows:
Go to the book's product page
Right-click the cover - "open image in new tab" or the equivalent for your browser
In the new tab, go up to the address bar. The last part of the url will be the image name in the following format:
imageinfostring.bunchofnonsensenumbersandsuch.jpg
Delete the stuff in between the dots, and the second dot so that you have
imageinfostring.jpg. Hit enter.
Now you will have the full image without the Amazon add-ons. Right-click the image, copy, then go back to the calibre edit metadata window, right-click in the cover box and paste.
It's a pain, but it works when Amazon has the only cover image for a particular book.
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