Since there is no damage to any person or property other than your own vehicle, the question or reporting the accident to the insurance company becomes really a question of money. The first question you must ask is whether your car is driveable and can survive long term without repairing the damage. If yes, then you may not want to report it or fix it. If no, then you have to decide depending on your deductible and the potential increase in premium. In other words, if your deductible is $500 and your premium will only increase $100, then it is worth reporting it to the insurer. As long as it was truly an accident, the insurer will pay $1400 and you will pay $600 out of your pocket to fix the problem. If your deductible is $1500 and your premium will increase $500, then, no, it is not worth reporting the problem. You will save the increase in premium, but you will have to pay the repairs out of your pocket. Does that make sense?
If he can afford to repair the damage and make the car safe without the help of insurance money, you don't have to report it to your insurance company. At this point you have no information that anyone would be making a liability claim against him, so I don't think you are endangering coverage by not reporting the incident.
If no damage was done to the property and no one was injured in the accident, then it does not have to be reported to the insurance company. Insurance, in this situation, would be used to cover the costs for repairs on the vehicle. If all required repairs can be covered out of pocket, then proceed without contacting your insurance company.
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