Hi Ben - I am a close friend of Scott's in Brisbane (Lucinda - Matthew Porter's girlfriend).
Not sure if you received Matt's sms before on this. I haven't heard anything much except from a girl (in a private message) from Perth (headed back today Aus today) who saw him there still when they left at about 12:45pm which doesn't really help as we already knew what time he left.
We are all fingers crossed over here that he is ok and found soon - we don't even want to think about the other possibilities... Keep on with the good work