To me it doesn't look like either Z. carius or T. holoxesta. Both have long hairs at the base of the palpi and on the head which this moth seems to lack. Also the moth is very elongate and the shape of the outer forewing doesn't seem to match those species. Xyloryctidae? - although I haven't found a match there.
I agree the palpi are wrong for Zacorus and Thema. It's shaped like a Philobota, and there is a plain white unnamed Philobota species. Fresh specimens of Philobota productella and chionoptera have some darker markings.