Perhaps you had books pending delivery when you got your new Kindle so they downloaded straight away? That apart, there's no way your Kindle automatically downloads the books that are sitting in your archive, you have to 'ask' it to deliver them, either via the Amazon website or the archive on your Kindle. Syncing only downloads any books that you've either bought and haven't had delivered to your Kindle yet, or books you've selected from your Amazon cloud storage. If it automatically synced all your books stored in the cloud to your Kindle, every time you read a book and deleted it from your Kindle it'd reappear on your Kindle, wouldn't it?!
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