I went through customs with a mess of dried mango from the Philippines a few years back. When asked if I had anything to declare I specifically asked the customs agent about my mangoes. He asked me to show him the package and when he saw that it was in a sealed plastic package he said it was no problem for me to bring it in to the US and it was basically treated like candy in that regard. However, I wouldn't suggest trying the same in Australia. I don't even think you can bring bubble gum through their agricutlure inspections there.