I have a collection of a few outstanding examples of the shells I have collected on beaches in FP and Fiji. I brought the vast majority home in my luggage for a friend who wanted them. But I want to keep the ten or so on my boat. So I emailed the Australian authorities about whether that was okay and they basically replied that it depended on the inspector at the border. As an entomologist I emphathize with their concern and have boiled the shells after thorough cleaning, and all were already cleaned by the ocean, none had someone living in them, but I'm still concerned they will be confiscated, so will probably try to mail them home from somewhere before I do the final leg to Australia this season.