There seem to be quite a few examples of a similar looking moth on the ALA. I suggest Epitymbia sp (genus), see here: https://biocache.ala.org.au/occurrences/487783a3-d92d-42cf-a1a8-10b8c3f5992e
Yes, that is right on track. But the ALA record is a transfer from iNAT of I think an incompletely identified sighting - it looks like Epitymbia scotinopa. Ours may be a form of that, or a different Epitymbia. I'll look further.
I can't match this to any described or undescribed Epitymbia. There are similarities of the dark lines, but only similarities. The dark line along the fw termen does not seem to be present in Epitymbia.