Australian Standard Deliveries - Australia Post:
Not to worry, should you happen to be out when your parcel arrives, your local postie will follow whatever is the standard parcel delivery protocol for your area when attempting to deliver your parcel. We advise contacting them to query any delivery queries or cards left by the postal service, as we are not privy to any information within their delivery network.
Australian Express Deliveries - OCS Couriers/Australia Post:
These parcels cannot be left without a signature but you can keep an eye on the tracking information provided in your dispatch confirmation email to get an idea of when your order may be delivered. If you are not home, neighbours will be attempted on your behalf however if this is without success, a card will be left for you as above. Australia Post will normally leave the parcel at your local Delivery Office for collection when convenient.