The thing I think that Bunnings could pick up from Masters is those "Customer Assistance" buzzers located on the areas where you need "a team member to help you" (ie the cut to length stuff). Press the buzzer at Masters and you get someone along quickly, while in some isles of Bunnies you've got a higher chance of a zombie outbreak occurring than a staff member appearing to facilitate your purchase.
And when Masters prompts me for my postcode, I just stab in random numbers as I have no idea what my postcode is - I've never sent myself a letter, and I don't have either a letterbox or even a post office box for mail, so it's not something I'm going to find out.