Ian, I'm afraid I cannot assist with any specialist knowledge on boomerangs.
I do live in an area that has a very strong Koori presence, and a living Koori culture, I have neighbours who identify as Koori, I have friends who are Koori, many years ago (notably when I still had some influence in public service circles) I was invited to acknowledge my (non-existent) Koori roots.
But I do not have any specialist knowledge of boomerangs. Sorry.
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