At the end of the day no MUNTER that steals a car is going to trawl the Internet to look for a plate to use. I can guarantee that whatever car u drive u can just go down the road and spot a car of the same model and colour as yours. Even if it was let say a GTi and somebody took the plate of GT, nobody would know!!
You were talking earlier of having a sticker on the back of your car. Who's to say the sticker wasn't removed or just added by yourself if u were really the criminal, how could the coppers prove anything from that??