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Calibre will typically generate an ASIN for the book (24 chars long or whatever). I don't know about any plugins that help with it, but the quality check thing might do it.
I usually open the book in a MOBI metadata editor and put the Amazon one in myself.
The Calibre-generated ones worked fine in the past, but they may be checking it now to see if book has X-Ray enabled. Still unsure if that would prevent it from loading a custom one or not though.
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