Aus Post only shows picked up scan
It's been a few days, and you only see a Picked Up scan on the tracking page? .... If you have received your confirmation email and you see a picked up scan, then your parcel has been collected and is definitely on its way.
There can sometimes be a delay in notifications being passed into your tracking feed - this will always self-correct on your parcel's next scan at a major sorting centre, and all missing notifications will drop into your tracking feed at once.
Your parcel hasn't gone off-grid. We are working with Aus Post to resolve this issue in the current tracking system!