What do I do if the owner reported his car stolen after the accident?

The owner was drunk the night he said his car came up stolen. His vehicle had run off the road, hit my neighbor’s tree and hit my truck, RV, and serving booth. The accident was caught on video. It was an unclear picture of the driver, white male, he left the scene walking and came back to get something out put the vehicle two minutes later. He got something out of the vehicle and left again walking towards his house. The car was not reported stolen until the police had gone to his house. He mentioned to the police that he had been with some friend and made it home around the same time the accident happened. He had said that he did not notice his vehicle was gone when he made it in the house. In order to get on his house, he had to pass by his vehicle but he told the police that his car came up missing 7 pm to 4 am. The wreck happen 1:33:20, around the time he made it house. The police did a stolen report. He told the police that someone took his keys, but in the vehicle only one key was in the van. A 2010 comes with a remote. When he came back to the scene, I believe he took the rest of his keys. The man said someone must have come on his house and took the keys, but no burglary charge was filed. The insurance doesn’t want to pay. I only have liability. The detective mentions that something is fishy about the guy. He believes that he was drunk and did not want to deal with DWI, so he left the scene. A thief would not come back to a scene. The man on the video walks like the owner also he is a white male. A guy came by my house asking about my RV at 9 pm, then ask me about my cameras, and if they worked. The RV was not for sale and it was an older white male that look like the owner’s father of the van that hit my property. Please give me the best advice. Thanks. I can’t run my business with my items that was destroyed.