Kevin - I've attached a header dump of a similarly affected book called Fatal Flowers by Enes Smith, also an Amazon .azw3. Of interest similar to your post include:
Key: "Input_Source_Type_(534)"
Value: "kpr"
Key: "Unknown_but_changes_with_file_name_only_(542) "
Value: "JkCn"
Key: "Unknown_but_changes_with_file_name_only_(542) "
Value: "JkCn"
Key: "kindlegen_Source-Target_(529)"
Value: "Source-Target:c1-c2 KT_Version:2.9 Build:0218-9566cc5"
Warning: Unknown metadata with id 547 found
Key: "547 (hex)"
Value: 0x49006e004d0065006d006f0072007900
Warning: Unknown metadata with id 548 found
Key: "548 (hex)"
Value: 0x496e4d656d6f7279
Key: "Unknown_(526)"
Value: "kindletool2.9 Build:0806-f6e82bf"
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