I am a seller, and on a couple of occasions a buyer has contacted me re a parcel not arriving. I always negotiate .... contact Australia Post (they are always very helpful). Also, I askthe buyer if it's possible for them to check with their local PO.
I have never had a parcel LOST by Australia Post. If there is a return address on the parcel, it should be returned.
My advice, talk to the sender ... there may be a perfectly logical explanation. (It's also possible there is a mistake in the address, and hopefully, the receiver is honest, and will return it)
Good luck !!
