Отслеживание почтовых отправлений Австралии: поддерживается Australia post track and trace: supported.
Australia post does not tracks outcoming registered items [R] and parcels [C].
However, it is possible to receive confirmation of delivery if contact to customer support.
Australia post can track as incoming so outcoming letters [L], due that, if destination post can track letters too, then it's is better use letter [L] that registered item [R].