Tasmania over the years, mainly at Hobart and Launceston. This venue may provide a "good spot"
to create an overview of what has been used to date.
I'll start with this curious usage on a large envelope addressed to Hobart from Norfolk Island.
Why the packet was handled through customs when it is from an Australian Territory and not
another country is anybody's guess ... mine is that it was placed in the "customs stream" at the
Hobart Mail Centre in error.

If you have any other examples of Australian Customs handstamps / datestamps used on the mail
(or comments/information thereupon), please post in this topic.