The vehicle was backed into a spot next to a median with a tree. Only on one side could a person possibly see. (I can't tell from the pictures how tinted the sides are, or if they have shades.) With that said, good luck having someone notice unless there is lots f noise. People tend to b wrapped up in their own lives around here and wouldn't necessarily notice what a car next to them has going on. Not that I'm saying anything bad about people here, I love living here. I'm just not surprised nobody noticed. To my knowledge, this store does not have night security in the parking lot
ETA: This article has a few good pictures.
http://www.dailymail.co.uk/news/article-3518911/Missing-mom-dead-SUV-3-children-alive.html