In my experience one or even two no shows hasn't caused any issues to an address but I am hearing from more and more people who claim one no show and the addy is blown and nothing more gets through. I have always posted replies on here debunking the myth of AU customs being super tight but I know of a lot of people who are not scamming and are definitely seeing a drop in success rates for o/s orders. My advise would be if you have a no show consider that address burnt and move on.