If you go have a look at r/DarknetMarketsOz or the Australian thread on Alphabay there is a pretty broad consensus that there is some kind of domestic mail police operation ongoing in Australia.
The number of reports of controlled deliveries and missing packages has skyrocketed over the past week. At first I thought it was FUD, but there have been so many reports that I don't think it's just a coincidence.
I actually think it would not be a bad idea to put a warning in the side bar.
I can't verify the talk on the Alphabay forums, but can definitely verify the talk in /r/darnetmarketsoz and that there is definitely something going on in Australia with our postage system but it only seems to be with Express Post (bright yellow packages) and not snail mail or registered post. I personally have had an item sitting on pending for the past 2 days which has never occurred before.