The smaller Mordellidae are hard to identify to species. This might be Mordella sydneyana, but I think it would be necessary to examine a specimen to be sure.
Having had a dig around I think we can go further than this, this might be a member of the genus Australymexylon. There are two spp. recorded in Australia. There are photo records for A. australe on Inaturalist and this taxa has more than a passing resemblance to these see https://www.inaturalist.org/taxa/1159906-Australymexylon-australe
Ok, I will get more. See https://dhseedharvestco.com/collections/australian-natives/products/solanum-laciniatum-kangaroo-apple-seeds for advice on sowing seeds - aimed at sowing into potting mix not direct sowing... I think ignore the bit about smoke treatment.
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