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You might want to hang on to it (and re-register), just in case DRM removal becomes more problematic in the future (e.g. if they stop supporting 'download for transfer via USB', or update DRM for that). You should always be able to download content to it (AZW/AZW3 format) and add to calibre from it, using its serial number, even if it no longer has access to Kindle Store.
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