I'm not so much concerned about the other locations---the cut could have happened while SA was moving the other items onto and around the vehicle, the blood on that latch to fold down the seat could have been left retrieving an item he remembered leaving back there, but if it was one of those actual items that were placed around the vehicle that caused the cut--then there should have been blood or DNA on it. I would think anyone who drove the vehicle would have wiped it down for fingerprints--or the blood left while wiping it down.
Another thing I'm curious to know is when the vehicle got to it's location that it was found it. For example, lets say it was the night of October 31st after everyone went to bed. It is so quite up there at night--that anyone in the vicinity would have heard the car start up or driving down the road. Someone on that property would have had to heard the vehicle passing their house if it was in the middle of the night--so that leaves us only the daytime--but--why risk it in the daytime when you could possibly be seen in the vehicle by family or customers. But that also leaves the question that if the vehicle was planted as some suppose--no one in the family saw or heard someone come onto the property? So that leaves me to believe it was someone at that property--was it SA, maybe, was it EA, maybe--were there 2 or more preps--maybe--could everyone at that property know---possibly.
I'm not sure how to post photos here but I did a Google map search. There's a road coming into the salvage yard from the north (?). It's down by the quarry. If someone entered from that road they wouldn't need to drive past the main entrance where all the houses are at.