Darker form of button beetle (paropsisterna or dicranosterna) like that of an earlier post (4257741). Bad photo, I'm sorry. Can't get them to stay still.
Found what I think is this beetle on the ALA: https://bie.ala.org.au/species/urn:lsid:biodiversity.org.au:afd.taxon:1fe08a27-87a2-48b1-8582-6662e64681a0.
Yes I think this is Paropsisterna octosignata. The second image seems to show a tinge of red on the sides of the pronotum, which is not typical of that species, as stated at https://sites.google.com/site/paropsisternablackpages/paropsisterna-octosignata. However that same website shows a Victorian individual that does have a red-margined pronotum.