This guy was trying to sell one a while ago, might still have it. http://www.skylinesaustralia.com/forums/topic/397839-trustquaife-6-speed-dog-box-skyline-gtr-for-sale/?hl=%2Bdog+%2Bbox#entry7229763
I believe you have to request a court hearing and then bear all the associated costs. If you show the cop made a mistake you may get costs awarded to you but then again you may not.