I don't want to sound like an "I told you so" post, and my heart is broken when I think of this boy. But I can count many things that were not done correctly, and that led up to him being missing.
I am not saying for any reason other than to hopefully make us all the more aware how important certain safety rules established by the BSA are followed. I know the adult (parent) here must already be blaming himself.
1. Use the buddy system. If someone has to go back to the camp, he goes with a buddy. No exceptions, It doesn't matter how far away or how long he'll be away.
2. If lost, stay put. If a lost hiker stay in one place, he will be found. If they move they will be found, dead.
3. Carry a small emergency pack that includes an emergency blanket, water, first aid, on all hikes. Get in the habit.
If just one of these rules were followed, he would be found alive most likely.