This somehow reminded me of a situation I knew of a few years ago. One of my co-workers was murdered not long after leaving work. Somehow on the way home she picked up someone. (He may have been an acquantence of her boyfriend.) They got into an argument and he killed her. He stuffed her body into the trunk of the car. Later, that night he decided to rob a liquor store. The police chased him for a few miles. They pulled him over and arrested him.
Now a few hours later he's posting bond. However, his car is still sitting ABANDONED on the side of the road where the POLICE left it! One of the police officers decides to go check on this car just hours before the guy is released. That's when they find my co-workers body in the trunk of the car! Needless to say, the guy was denied bail and put back into jail.
So you may need to check the local laws on abandoned vehicles. They vary between city to city to state to state. Why the police never towed this vehicle and searched it is still a mystery. I do know that if they see an abandoned vehicle on the side of the highway they do mark it with a bright orange sticker. After a day or two they then officially tow it. I've seen cars last a week on the side of the road before.
You can always call the police and tell them you "smell a strange odor" coming from the trunk if you want. That may get some kind of action!
