Send large parcels to your work address. Small parcels work fine as they are delivered by your postman.
The reason is that Australia Post subcontracts out large parcels and the subcontractors are way too happy to slap a "unknown" sticker on your parcel if there is no-one home or they can't work out the address. They are supposed to return the parcel to the local post office but they don't.. This means it goes back to US or wherever by seamail. You lose the package that you have paid for and there are fines at the other end for the sender. They have a 100% failure rate for my old address and cost me a lot of money.