FedEx obviously gives priority to their own freight...who can blame them.  FedEx was a well respected company long before the GSP came on the scene....I would love to know what rate PB pays them.  I would guess it is peanuts.

My parcel has arrived at Dulwich Hill, local PO.  It states it was delivered at 10 pm on Tuesday night.  It's now Thursday night.  As I didn't receive it at 10 pm, am I right in thinking it's still at Dulwich Hill PO?

If the tracking states that it was left at the PO then that is where it will stay until you collect it.  Did you receive a card?

give them a call: (02) 9569 1229