I haven't read all the replies but I did want to add that I read in a very detailed news article this morning that the mom reported the car stolen first but didn't mention that her son was in the car. It is unsure exactly when she finally reported the child in the car but it appears the police immediately issued an Amber Alert which was 2 hours later. From the article it definitely implied that the mom didn't report until hours later but they didn't quote the police as saying so. I cannot fathom that detail being left out when you make the original report. Why? It was 7 hours later the car was found with the boy dead. So those two hours could have been important. If you read some of the social media comments, which taken with a grain of salt, there are other suggestions as to how this happened. I hesitate to post them because they aren't verified but in a way they seem more plausible than not reporting your child missing with the car instantly.
The math doesn't add up. The car was left on approx 1am. Let's say it was a quick trip to the store. So the mom would be back to the car around 1:30am. The amber alert came around 5am. A bunch of people on my facebook feed were talking about it. I guess they sent it to everyone in the state. I don't know how those work.