Here are some clues you could give:
The driver's seat and mirrors could be adjusted differently, hinting to a different anatomy of the driver
The air in the car could be filled with a certain smell hinting to a different person (like an aftershave, if it is a male instead of a female, or a smell associated with a certain working environment like a kitchen, or a fish market)
There could be direct traces, like a lost hair, a shoe print, or hand print, that wouldn’t match the owners physique
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