Then please allow identical bodies for 5 seconds - and hey it's actually a possibility according to quantum probabilities.
For those 5 seconds, you are in Perth and not in Sydney. Shouldn't that be a ridiculous thing to say if there is absolutely no difference between you both?
You are a a property of the your body.
Thus you are where the body are.
It is only if we assume that both bodies are quantum mechanically entangled then we could say that the minds is one and the same mind (but since entanglement seems to require very little actual intraction = very low temperatures that would probably also mean being dead)
Again, as I said in my first post in this thread: you must have some strange assumption that the mind is not local in space.