It happened to me before, I called up Aust Post headquater and get them to show the proof of my signature, they emailed it to me and obvious enough it was fradulent, the signature was simply a crooked line. Status of my parcel on the online tracking showed delivered, but I actually did not receive the item at all! I made several calls and spoken to different operator as well as email to the head office and warned Aust post that I will report to the police, shortly, after two days, the parcel magically reappeared in my letter box!