it would change the current speculation/theory as to whether there was foul play or the motive, such as whether AW abandoned it himself or what the motivation was if a third party was involved.
for instance, if the car was locked with the key fob inside, and the windows were closed, that would be highly...unusual. I would think that means a second key fob was used, but AW was driving a loaner car.
The media/links page only mentions one article where the brother Tim says that the car was found in "good condition" and locked.
I haven't really followed this topic recently so I don't know if any new info was revealed or theories changed.
JMO, speculation only.