Well I don't think that guy you talked to you is right .. Granted its been a long time since I worked for aus post but somethings like wrong postcodes don't change much ..through the system if the postcode is way wrong it will likely cause a delay with delivery .. If no one corrects the error it can go round in circles for some time .. If its a little wrong it can still be delayed by getting delivered to the wrong sub office or contracters delivery depot.. meaning again its got to go back through the system .
Once at its point of delivery the postcode dosn't matter the parcels leave the office and are delivered as adrressed.. mostly.
The delivery guy is often dammed either way when the customer stuffs up an address.. The expectation is you should of known that package didn't belong at the wrong addy as it was addressed to , or conversely it should of been delivered as addresed ...Are you new to this area ? .. as most of us knew the names initials ect of most people who regularly got mail on our patch , no street names , suburbs you mostly found the right place .. best I saw was a letter mailed to P..K the old posty on a run of maybe 2000 residences picked the owner straight away in a large unit block as well.
Neuman on sienfeld used to crack me up.. as I can so identify with the jaded postal worker .. and some of his antics with the mail were so very,very close to the truth
jethro .. or "possibly" the missed you note is slipped to the postman before his mail run starts .. and despite you anxiously waiting for that parcel contracter to come up you street with your package you just don't see him at all