Do you think they are becoming harder to find? We're noticing this over here. Our 'most common' species, Pinnoctopus cordiformis, used to be super abundant on scallop (Pecten novaezelandiae) beds, but now that these are few and far between so too is the octopus.
I was looking at some photos of one of these octopus taken in the 60s, inside a lair adjacent to where scallops must have been prolific. The octopus den was absolutely surrounded by piles of the scallop shells ..... not something that you would see today at all!