Good on you doing the decent thing and leaving your details!! Here are my accident tales.
I reversed into the back of a van a couple of months ago - he had driven in the exit of the car park and gone past my car and up round the end of the row of parking bays; I checked my mirrors before reversing and all seemed clear - except he wanted to go into a space in the same row as me so had reversed as well but, for some reason, rather than go straight backwards he let the car roll back and round the end into my path. Because he was stationary and I was reversing, it was my fault. We exchanged details and took photos - my car had a broken rear light unit and a couple of dents in the bumper and the boot; his had some damage to the bumper and light unit - but he also had other damage, parts held together with gaffer tape and there was far less glass on the ground than was missing from his light! He said he would get a quote for the parts and call me, I said I was using my insurance (glad I did as the repairs came to almost £2000!!)
Found out this week, after receiving a letter from the insurers confirming they had closed the claim as they paid out for his damage, that he actually told my insurers he wasn’t claiming as he didn’t want his vehicle classed as a total loss write off and therefore they didn’t actually pay him anything. He’s never contacted me about it and my insurers have told me to get back in touch with them if he does contact me!
The amusing accident I had was about 20 years ago, driving from Surrey to Wiltshire on a winter’s Friday evening in the rush hour; stop start traffic approaching the M4 and this car goes into the back of me at relatively low speed. Cracks the bumper and damages the boot which also affected the opening mechanism of my not that old at the time Renault Clio; exchanged details, took photos and he gave me his business card - he was a loss adjuster for the same insurance company as I was insured with at the time!! Got very swift resolution and repairs done almost immediately. About a month later I received a hamper and big bunch of flowers from the chap by way of apology!
Last one, similar situation to yours except I was sat in the back of a car with tinted windows waiting in a supermarket car park for some friends. Another car pulled into a space, completely misjudged it and scraped all the way down the side of the car in the next space; took paint off and dented rear wing and both doors. Stopped, got out and took photos; I overheard them tell someone who was walking pst that they were leaving their details - and I watched them write a note and put it under the windscreen. Except, after the people they spoke to walked away, the person removed the note, got back in their car and drove off. I took a couple of photos of the car as it pulled
away, including their number plate. I left a note on the damaged car saying I had the details fo the car that hit them as I saw it happen. Had to write a statement for the insurers as, initially the person denied they were involved!!