Because we Australians live in a land that is 'UGE and most of us were farmers we often borrowed from our neighbours and they always knew where their item was they just had to come on over and pick it up as we were/are to busy borrowing something off someone else to return your goods.
Sorta long term you might say and this practice extends from the Boer war, WWI-II, Korea, Vietnam, Malaya or wherever our troops are stationed that they feel free to borrow from their neighbours station an item they require for their needs so it is not pilfering it is technically;

Justified long term lease on an item that is required by the unit to fulfil its obligation in remaining prepared and alert at all times, and to paint the red roo on the side identifies it to all Australians so that they can feel free to borrow it anytime they need it so you see it is instilled in us and we are taught this trait as children, I mean they did not spend anyone's money did they