Having been on the scheme 30-years this year and 11 cars later, my No.1 rule on collection day is always always always walk around the car to check for dings, dents, scratches & that the vehicle is the exact same model & spec that you’ve ordered. Only then enter your PIN number when you’re happy.
Some dealers genuinely get it wrong occasionally. Others will try and pull a fast one. Most are honest & decent I’ve found. But remember ; the onus is always on you to do the above.