No Injury No accident

So a stop light turned green and I released my brake and accidentally bumped into the minivan infront of me. There was no damage and no injury, but they insisted on calling the police, upon police arrival we said that we should just exchange information and be on the way saying it was one of the lightest accidents hes ever seen, But a case report was made, clearly stating that there was no injury and no damage. There was a girl in the car, and the officer said he saw no injury to her or anyone else in the car.

I doubt anything is going to happen because of this, but what are some consequences that could occur. What could they claim to insurance companies, and what are the chances that anything will happen from this.

This was my first "accident" so I'm a bit worried about it.
Thanks.