This is why you don't try to import significant weight into Australia. Over an ounce from Netherlands would be likely to make it into USA, but if you are in Australia keep it to 5 grams or so I would say. People debate about how effective Australian customs are, but just the number of stories we hear of people having interceptions of fairly small orders (ounce) is enough for me to be convinced that it is harder to import into Australia than most places.