Wish I knew someone at AP at times.
I found this interesting. What items can be tracked
https://contactus.auspost.com.au/app...etail/a_id/682
You can track a Registered item apparently but only if its one of the above items that has been registered.
https://contactus.auspost.com.au/app...FfbHFOaw%3D%3D
And a bit of detail about Registered post in general.
http://auspost.com.au/business/registered-post.html