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It is to make sure you were telling the truth for proof to manufacturer and send back to manufacturer. They are not going to let you just keep it, because even if they tested it and let you keep it, it could start working again and you get two phones. It is a warranty exchange, and if it is defective as it seemed to them, then they have to have that device sent back to manufacturer to swap for the new one you got. Why would you want to keep it anyways, if it did not work?
Alright now that makes sense. I was just curious to what they would do with it, thanks for the relpy.