Well -- did he ever do anything awful to one of the Hogwarts elves? Because attacking a post owl would be rather like that. He wouldn't know it was unregistered, it would just turn up with post like any other owl. Even if Carrow thought there was something odd about it, by the time he even knew to wonder the owl would be gone again.
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Date: 2011-07-01 12:09 am (UTC)