Depending on where and how you placed the order and what was shipped...By all means remember that you can FIX SOMETHING HERE rather than just be a victim. There are local, state, and federal complaints to be filed either in the US or Oz, criminal complaints that basically require you to file them and then the government takes over. Once a certain $ threshold is crossed, in the US it automatically becomes a matter for the FBI not just local authorities. AU$9k might well cross a threshold, in both nations.
In the US that might include our Postal Inspectors for mail fraud or wire fraud, for taking the order and then not fulfilling it. A lot of bounders will ignore anything you have to say--but when the postal inspectors say "We're cutting off all mail delivery and looking into jail and fines for you" they sit up and take notice, because without the mails they have a harder time stealing more money from new victims.
Ask your authorities, ask our authorities (USPS.COM should have a referral link to the government postal inspectors, the "post office" is just a .com here) and by all means--sic 'em on the guy. What will it cost you? The price of a letter or a notary stamp?