I live in Tasmania
Danito, I am going to put my Australian knife law hat on here.
You are in luck that you live in Tasmania because unlike Victoria for example there are no internal laws against switchblades in Tasmania. So even if the authorities would consider an AO a switchblade within Tasmania you are OK.
However, you do have to get around customs. They may consider an AO to be a switchblade and then you'd have to wrangle with them. One way to ensure that you don't run into trouble is to get a permit to import. It's just a form here. You'll also need a form from your State police but since the law's on your side locally that should be a breeze. Trouble is that you may not want to wait.
The other way is to do it after the fact, if you do have a problem. It's entirely possible that they won't even check your knife. If they do it's possible that since it's only an AO they'll let it pass. If in a worst case they do hold it they will let you know and you'll have a chance to make your case. At that point you could tell them that you never dreamt that an AO would be a switchblade and do the above paperwork and that should work fine. The choice is yours but the only thing you stand to lose at worst is probably time.