A couple of comments and observations.
1. I agree with Satch about the breaking and entering in that Perry was more concerned about it. Did he have partners or did he break and enter on his own?
2. A couple of reasons why he abandoned his car: 1. He had to go to the bathroom. 2. He had a concussion and could not focus on driving anymore. 3. If he was under the influence of drugs or alcohol this would influence his panic attacks. Also, he was getting sick to his stomach along with a possible concussion. 4. No proof since he was not found he could have ran into the woods and died of the elements.
3. We do not know when he left his car. He could have left it earlier and died. Valiant mentioned this in a previous thread that is could have stayed idle for a while. This is not his exact words.
4. #83 and #92 about someone else driving his car. If true, were fingerprints taken from inside. Would a running engine and opened door indicate to the police foul play. Also mentioned was a possible hit and run, any evidence of another car in the area. (Blood, tire marks from stopping suddenly, evidence disturbing the area nearby, skid mark etc.)
5.Phone call and not notifying family. I've learned that if someone is going to live a new life they would have to let go of the past and not notify family. For example, the girl in Arizona who disappeared in the 1990's and was just found alive. Why as an adult did, she not notified police or family? The phone call could be real, only Michael can determine if it was his brother's voice or a prank. What date was the phone call? Any significance to Michael of the date. I know the year was 1992. He has two other siblings what about them. Is the father still alive? 18 years, maybe his conscience was bothering him.
5. If he did leave on his own, if he had a partner with his breaking and entering, he could have gone to the house and asked for help, mentioning that they were in this together. Then I could believe that they deliberately set up that scene and the phone call years later. I believe that he died that night with the reasons listed above with a concussion and disoriented with alcohol or drugs.