They were in the trunk of one of the fathers' cars in the driveway???
If this is true, then when mom came back out in the 5-10 minutes she says she was gone, wouldn't the kids have been yelling inside the trunk??
I would think so.
Maybe the kids were simply playing, only how would they have closed the trunk on themselves? Besides, they'd have started yelling, kicking, and banging on the trunk lid, and someone, the mom, would have heard them.