I dont understand you did break the law, end of story you will have to cop it. You are allowed to purchase ctp (from suncorp or who ever) then drive a vehicle on the road with no registration plates or registration to your destination to have it registered, if its going to get a roadworthy before hand it has to be towed etc not driven on the road, What would have happened if you ran over someone or something even if its just around the corner you would be in deep sh*t and would not have a leg to stand on. Sorry not much you can do.