I've read that in a lot of places in OZ, especially Out Back, Law Enforcement doesn't really get too worked up about the odd shotgun or old sportered Lee-Enfield sitting in a closet in a ranch (station) house. Farmers and ranchers in many cases, being, you know, Aussies, said the hell with that and just ignored that law. Considering that Oz is the land where just about everything wants to bite, stab or stick you, and law enforcement or medical help can be many minutes or hours away, this does make sense. The Australian Police really, really follow the British police line in the big cities, but when you live with the same people in a little tiny town out in the middle of nowhere, well, common sense dictates that you become a "Peace Officer" more than "Law Enforcement". You know who the villains are and who can be trusted with firearms and who can't be.