I had a reply from Aus Post just before 5pm, admitting that they have lost the parcel. To receive a refund I now have to send them a copy of my posting receipt (I posted into the red post box!) and a receipt for the wholesale purchase of my book (I purchased last year, read it and then put it up for sale, so no receipt for this either). I have asked them how else they can help me as I purchased the tracked satchel (obviously), expecting Aust Post to deliver it safely to the purchaser and they have admitted to losing it!  Can't wait to hear a reply to this!!!!