Boy a couch can do some damage.........
Who was this person that called him to ask if he hit your car and why did he know that???
In the fog leaving work in a paved parking lot once in the '80's in my 3/4 ton '78 truck I thought I bumped over a curb. But a co-worker in her '65 Mustang honked at me to pull over. I just had to take her word I hit her - no witnesses - no damage to my truck.
So yes, you can hit someone and not know it. Especially on a bumpy grass lot.
I paid cash to keep it off my insurance, seems like it was $500 back then for bumper/fender work. probably would be $2,500 today who knows.