Sorry, first ever post, so just getting the hang of it.
Yes, alioop, I think that the police may have pieced together a lot more about what GBC did that morning in the Captiva. I distinctly remember seeing a television report about police searching industrial bins in those first few days. I think they knew he'd disposed of crucial evidence. For some reason, I'd always had in my mind that those bins were at Indooroopilly Shoppingtown, but I don't know whether that's what I deduced from the image on TV, or from the local rumour mill. (which I have to say is proving to be a quite reliable source!!!)