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I also have the same issue, so I looked into azw3 books in binary editor and for books originated from amazon, their ASIN (such as B007TBSL9U) is stored near the title field in the beginning of the file. By some reason ASIN is always specified twice.
On the other hand, in AZW3 books generated by Calibre, I couldn't find ASIN string at all. My guess is that Calibre is simply not writing this metadata into AZW3.
Kovid, I can send you a couple of original AZW3 files with all metadata fields for your experiments if needed. I really would like Calibre to add those missing fields.
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