It was sent out in internal comms (WoW) on Friday morning. Started Saturday. When you give the checkout operator bags, they are to scan a barcode and then type in the amount of bags you have (up to 30). If you don't have enough bags for the shop, they are to give additional 15c bags at no cost.
Of course the entire thing is a ploy to increase profits. Just look at how they have dealt with the online side of the bag issue.
Prior to the removal of so called "single use" bags (which I have always reused as shopping bags), in the states that had already banned them, they used a different free bag for online, as they weren't allowed to charge an unknown amount for bags (as the amount of bags needed would be unknown at the time the order was placed), that met the requirements to avoid the ban.
Now they have removed those bags are are charging $1 per order for bags, with no way to avoid the charge, even if you already have bags you would have used and don't need/want more.
Woolworths only comment about this was to pay the $1 and bring bags back the next time for recycling in Woolworths "Redcycle" program - which Woolworths makes money out of.