Hi Nathan,
Beautiful snakes and one of my favourite small elapids. I've caught hundreds of them over the years. They're still very common and found in a variety of habitats (don't know what Magnolia trees have got to do with it Bushman...lol) including sandstone ridges to sub tropical rainforest along the coast and into the ranges from Batesman Bay in the south to central Qld in the north. Used to find them in man made sandstone walls in your area as well as amongst sandstone ridges at West Head, Kurringai Chase, Dural and around Frenchs Forest. They can be a bit difficult to find during the day but night spotting in the right places during summer around the mid north coast and up through the adjacent ranges will turn up heaps.
George.