Could have seen the car color, manifacturer, model and contacted authorities, they can check what shop sold what car. At least it's like this here, if you buy a new car you can still receive speed ticket (if you drove above the speed limit, that is), the cops check your car model and color and check with the vendors. They get your information with the sellers and get to you. Dunno if that's just with infractions caught by cameras or guards though.
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FFLmps3ad A+ C- D- H- M- P- R T+ W-- Z- Sp-- RL- a c++ d- e++ f-- h* i+ j+ p+ sm