This seems to be a secret return policy. From Amazon's
Kindle Return Policies:
Quote:
You can return any Kindle you purchased directly from Amazon.com for a full refund within 30 days of the day you received it as long as it is in new condition
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and
Quote:
Prepare Kindle for shipping: Please place your Kindle in the original packaging. You may still return the Kindle if the box has been opened. It is not necessary to include the manual or accessories.
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I don't see anything about "open boxes", and you should only have to pay for the return shipping.