The answer to your question is: Henderson, in Victoria. This is the time of year (August-September). They tend to be deeper, but people "routinely" see them in 70' at Henderson.
My understanding is that they haven't been showing up to Hornby in recent years. I spent three days looking for them and never saw one. On my first dive looking for one in Barkley sound I saw one at 110'. It took two very close passes by us (by buddy reached out and rubbed its side). I've seen loads of sharks in tropical waters, but seeing a six gill materialize out of the darkness was a experience I'll never forget.
There have been at least two sightings in Port Alberni (at China Creek) in the past couple of weeks.
There out there but, like Al said, most people put in hundreds of dives at these locations without ever seeing one. I'm willing to bet the sharks have seen Al though...