Australia has some of the best customs in the world, take it from somebody who has been around long enough to see how long people in Australia last before they get a package intercepted versus anywhere else in the world. Australian customs check almost 100% of incoming mail the only way people manage to consistently get things through is if they fit in a letter sized envelope. Even a DVD case of drugs is going to be a challenge. What is the biggest shipment that you have ever gotten through? I don't care if you answer, but my bet is that it was light flat and fit in an envelope.