I have come to learn aust Post can't be trusted, Even if your sending a letter next door it can take up to and more than two week's.
I sugget that people take every procation as to tracking and lacating ur letter/package.
For Seller's that don't offer Registered Post or Express Post ( Even though it's at buyer's expensence ) , I STRONGY suggest you look into adding the choice.
For Buyer's spending the extra $2-$8 ontop of normal price of postage is a MUST, Fisrtly you can track your letter/package ( Which is great ) and Secondly due to first reason it save's constant email's/phone call's to find out about your letter/package's progress. The 3rd and most important reason is that unlike normal post Registered/Express Post has a 95% garrentee of ariving ( 10% aweek , 1 billion letter's aweek = 1,000,00 go missing ), So to save heart ache and loss of your hard earned money please take my advice.