Reports are all over the place, as usual in rapid development.
Let's slow it down to what little is fact. Not much I know.
Could the parents report any sooner? No, everything tells us no. Call now if you want and you will get told wait X amount of time.
Why didn't they try? Either they tried, or they knew not to, or they were involved. Let's not go to involved yet, unless police reports of abuse and drugs in the past start showing up.
Where was the child's remains found in relation to the home?
Did anyone in the home, or known to the home have a truck?
Did neighbors in the radiating blocks have similar trucks> Well, someone posted earlier google maps says many, but how old is google maps, and was the truck involved.
Now, let's wait for the DNA from that tarp, that WILL happen.
Why was the child dropped in that location? Or was it via speeding truck?
What have the neighbors seen in the last day that is unusual? The last few days?
Any known sex offenders, listed or SUSPECTED, there is a difference, in the neighborhood? Uncle so and so may never have been caught or went all the way, until it all went wrong, and staged. I don't think this is staged, but we have to wait for the ME's report on when the bag and ties went on, and TOD.