I have not been able to find a source showing the sggs of this species online. Does NaturMapr have such a record? If so I cannot see it in the sightings formthe species now. This reference says A. nigriceps has small white eggs. https://prpw.com.au/project/white-antennae-wasp-moth/ Although the Australian National insect Collection has recorded this speces as adult moths at the former Black Mountain light trap, there is ongoing uncertainty about idenfifying mainy Amata (genus) moths to the species level.
On Radio National Health Report they have a W.T.F. segment at times. I suggest instigating a NM AI W.T.F. page!!!!! My understanding is these are 'mummified' aphids that have been parisitized by wasps. see https://cesaraustralia.com/pestnotes/wasps-ants-bees/aphid-parasitoids/
see https://inaturalist.ala.org.au/observations?taxon_id=354557 especially e.g. https://inaturalist.ala.org.au/observations/387162085 I used to see aphids on roses lifting their bums and exuding stuff and waving about as these little wasps approached. Not happy aphids.