What if you failed to get the insurance information of the party at fault in a car accident?

If you failed to contact the police after the accident you may be in serious trouble here. You have no proof that an accident even occurred except for the damage to your vehicle. Do you know the other party? If not why would you allow them to leave without getting some information from them? This sounds fishy to me and I'm sure it will to your insurance company as well. Unless you plan to just pay for it yourself, I would recommend that you tell the company the whole truth in the matter and not try to make up something to help a friend as they have seen it all.