Amazon clearly state in their warranty conditions that they can (and, posts here suggest, generally do) use refurbished devices for warranty replacement:
Quote:
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During this warranty period, if a defect arises in the Device, and you follow the instructions for returning the Device, we will at our option, to the extent permitted by law, either (i) repair the Device using either new or refurbished parts, (ii) replace the Device with a new or refurbished Device that is equivalent to the Device to be replaced, or (iii) refund to you all or part of the purchase price of the Device.
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(emphasis mine)
https://www.amazon.com/gp/help/custo...deId=202197860