I had just been noticing that the plain Epiphyas caryotis have some marks on the inner margin. A longer one adjacent to the tornus another smaller spot about 1/2 way along. SO maybe totally plain yellow torts like this are Standishana concolorana as these seem to be without marks there. The wings do seem to have a metallic sheen on BOLD (Hobern). see https://bold-au.hobern.net/specimens.php?taxid=366794 as oposed to https://bold-au.hobern.net/specimens.php?taxid=366843
Female E. caryotis may well have the marks on the inner margin, but I' m not sure that's a reliable characteristic alone because those marks may not always be visible. I seems to me the E. caryotis females also tend to have heads the same yellow colour as the forewings, whereas Tortrix/Standishana concolorana moths seem to have a darker or a contrasring orange looking 'head and shoulders'. https://moths.csiro.au/species_taxonomy/epiphyas-caryotis/ https://biodiversity.org.au/afd/taxa/Standishana_concolorana