Burwood Australia Post office kindly advising when my package would be delivered. The number is legit and ok to answer or call back.

Caller: Australia Post Burwood VIC

Australia Post called, as had packages for us but Punthill Burwood Apartment Hotel, where we'd been living, had closed. Safe to answer.

Seems it’s Australia post or someone related. Called to confirm the number of the street for my order with missing street number.