Gordon, if that message to Dien about the cave is anything to do with the ancestors or legends of Australian indigenous people, I would say don't even think about it unless you have the same ethnic background.
Sand etc is almost certainly protected in most States and Territories if not all but you might be able to get permission.
Have fun talking to the Public Servants. They say they are there to help you.
I have sold shrunken heads and know someone who is apparently making a killing with hand operated barrel organs (supply your own monkey).
There is a market for everything. Just pick the right time, place and make sure the potential customer can pay you.
Sounds easy,doesn't it?


Just Magic tricks in the shop, but in the storeroom ...!