Oh, I thought the passports were sent with tracking. If you got the notification it was being delivered, then it probably was being sent with tracking. If you don’t have an auspost account, it can be worth creating one because it’ll try and use your details to match parcels to your account if the parcel is eligible for tracking, even if you were never informed of the tracking number. It uses your name, address, email, and whatever else is on the parcel to try and link it to you