I personally wouldn't bother about hiding the fact its Jailbroken, especially for the Genius' in Australia. I told them I wanted to buy a product from them, the said product was to be used differently than what it was intended to be used for. I told them I want to buy it for Jailbreaking reasons and they replied, "Look, we have a 14 day return policy, and you can return back the item for any reason if you are not satisfied with it."
Purchased the product and havn't gone back! 😀