Just a warning folks.

 Got off long phone conversations with Aussie Post and eBay customer service who naturally enoughed blamed each other and suggested I call each other. Long story short: the "Print Post Label" system in Ebay is generating dud labels that the post office can't accept and cannot be tracked. If you click on the tracking number that is generated when you purchase a label ( for a 500g satchel in my case) and click it again to get to the Aust Post tracking site you will see it says  "Product not trackable". No worries taking your money though 😛

 No solutions or timeframe offered by eBay staffers. The suggestion was to cancel the labels and pay over the counter.