Oh, the dispute isn't about which Europeans first spotted/settled the place -- it is about who in the Aboriginal peoples was here first. The variations are between 3 - 5 movements into Oz, but there's also a school of thought that says that people may have left, not come here, based on the lack of water travel.
And Aboriginals were hunter/gatherer tribes that didn't have settlements, because of the lack of domesticate livestock and no planted crops. Essentially, they were what you get before settlements. So as long as I stay away from migration routes, I'd be unnoticed.