Trapped in a Car Trunk

Once out, Jon was able to see what he was trapped in. It was the trunk of a car. How did he get in there? Did someone kidnap him and put him in there? He looked down at his hands and arms, looking for an indication that he had been tied up or restrained. But he saw no evidence of it. He certainly wouldn't have willingly trapped himself inside there, so there must have been another reason. But he had no idea what. He took a look around, and in the distance, he saw ...