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The APNX file gets generated when you send to the Kindle from calibre (assuming you have that option enabled) and will only be found on the device. Or you can use the standalone APNX file generator plugin which is in these forums. Note the latter does not yet support pulling the value from a custom column, so you will get a count that differs from what this plugin generates. However for your purposes so long as it has the right filename it will do just to see what you actually end up with back on your Kindle after the email process.
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