@Harrisi Stuart, I got the possible ID from iNaturalist. https://inaturalist.ala.org.au/taxa/1559142-Castiarina-luteipennis ALA also has several sightings but not photos apart from the main one. https://bie.ala.org.au/species/https://biodiversity.org.au/afd/taxa/63f15e34-05c8-4cb9-8b14-266fa0e32cd6#overview
Similar images also appear in 'A Guide to Beetles of Australia' p. x (George Hangay and Paul Zborowski) and Shelley Barker's 'Castiarina' under Alison's suggestion.
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