How do you check if supermarket chicken is halal?

Quick one for the group. When you buy chicken from Woolies or Coles, how do you actually decide if it's halal? Some people check the EST number, some look for a certifier's logo, and some just stick to their local halal butcher. What's your rule? Butcher only, or do you trust supermarket chicken? And does the EST code actually tell you anything useful? Keen to hear how everyone handles this one. (Side note: you can type any AUS EST number into our checker at halalhq.io/au/meat-est to see its halal status and certifier.)