What Duck Pilot says. Best advice I can give is tell CASA as little as possible. Do not EVER volunteer information to an official, they will only use it to convict you. - there is a website that goes into great detail on this subject (why you shouldn't talk to police).
As for W & B, I always have a scrawled bit of paper with the most usual W & B situations with me on board, full fuel, etc. When touring, I did an exercise book page with accurate weights of me, Mrs.S, luggage etc. and full fuel and the resulting CG.
It is interesting that the proposed regulations (can't think which 91?) created an offence of landing with less than statutory reserve fuel. If that ever goes ahead, then CASA can add to the ramp check your fuel plan and make you dip your tanks as well.