OK we don't have homeless as an American or UK would picture them.
Somewhere like Murray Bridge wouldn't have any visible homeless problem at all, lots of government housing.
There is a lot of what we call "dole bludgers" that is people on benefits of one sort or another.
There is a lot of meth up that way. All the problems a semi-isolated, not very wealthy small town would have.
But Wynarka is different, if you can draw an imaginary line between "town" and country, Wynarka is DEFINITELY country.
Strangers would have absolutely no reason to go there. Its not on the way to anything at all. A dot on the map.
Re Caucasian - they had her skull, and Caucasian skulls are shaped differently to Aboriginal skulls. I bet they are reconstructing her right now and soon we will have a face.
They can also tell a lot from teeth - Adelaide water is highly treated and those levels are measurable in residents thereby a good way to trace someone's background.
Honestly the suitcase guy CAN'T be a red herring, there simply aren't enough people wandering about Wynarka. Every local driving by would've stared long and hard at some strange face with a suitcase. It would literally be a once in a lifetime sighting for some of them. Its a TINY town and quite literally, the back of beyond.