People tend to check in during these times:
AUSTRALIA POST SURRY HILLS
Unconfirmed but rumored to be a portal straight to the fiery pits of hell.
There is a latch by the carpark near Baptist St where you can pick up parcels from 7:30 (i think) till 9am.
When in the queue, people watching never fails to deliver
not yet confirmed: apparently there's a latch in the car park where you can pick up parcels etc. from 7:30AM. Otherswise not open until (yawn) 9AM.
Pick yourself up a parcel. They do a wicked padded envelope!