Maybe it is because half the country is on fire. Including Tasmania.

I know no mail went out of Canberra on Friday or Saturday. Mainly because the Hume Highway was shut and they couldn't get it anywhere anyway. Why would couriers be different? They demonstrably don't have the technology to teleport things.

Fastway is not eBay's courier company. They have a deal with Sendle, but it is generally the seller's choice as to how they send things.