Although it is possible to put travel bugs in caches listed on Geocaching Australia, we would rather you didn't because Geocaching.com does not track a Travel Bug through caches it hasn't listed. The Travel Bug would 'disappear' as far as Geocaching.com is concerned, eventually reappearing when it is logged into one of their caches again.
Travel Bugs can be purchased in Australia from Sphere Technologies. They retail for about AU$8 each.
Geocoins are a special type of Travel Bug.
Can Travel Bugs or other Geocaching.com trackables be placed in Geocaching Australia caches?
While possible, it is a practice that should be discouraged as the gc.com site does not have a mechanism in place to show that the item has been dropped off in a non-gc cache.
The trackable item then goes into limbo, showing it as still being held by the last cacher. People setting out to seek the item will not be able to easily tell it's actual location. The stay in a gca cache also will not count towards any statistics belonging to that trackable.
GCA swaggies, however, WILL work on caches from most sites.