I should add a bit more about my W.A. arrival for info. Our G2G passes were still green as we got off plane and we had what I think is a normal arrival process where the police checked our app and then a few screening questions and off we went. No mention at all about the case in Hobart airport just before we left.
during the early evening I got a few calls from a non-ID number which I ignored. No messages. Then about four hours after we arrived I got a text message from the W.A. police asking me to call them which I did. They asked when I was at Hobart airport. I told them that my check in app gave 2:46 pm arrival and I depared the terminal 3:45 pm and he said fine, no worries And that was that.