Same deal as this post but they have delayed it a week for WA most likely because it's taken longer to get the stock here into stores, thanks to South Australia's recent moist train track issue.
Simply scan your card barcode in store. No purchase required.
Not sure if it's targeted, shows up in mine and 2 other people's accounts I know of.
I saved the rewards 2 days ago and this morning still there, now gone and no new offer