I understand that Amazon does keep track of the IP address you are downloading from (and it doesn't matter if you use wifi or not). If you keep showing up as connecting from Australia, and have logged a U.S. address, they will send you an e-mail eventually. I'm not sure what happens after that, or even if they do that systematically, but just because they don't react the first time doesn't mean that they won't react at some point.
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