Since when do cops warn potential criminals to ensure they aren't arrested by their foolproof sting?
My guess is if Australian police were that effective at catching SR users they wouldn't say anything and just let the thousands of arrests pile up before announcing the massive "victory" in the "war on chemical compounds which are organized into structures deemed undesirable by authorities". One person was arrested and there is no evidence that SR, TOR, or Bitcoin had anything to do with that arrest. It could be anything from the guy was an idiot and talked too much to he had bad luck and one of his "packages" was damaged enroute alerting the authorities.
Note: D&T isn't responsible if I am completely wrong and you end up getting busted.