What happened to the kid who attempted to go down into the hole after “the Box” was gone?

Every week new supplies are sent in, though the Glade is largely self-sufficient. Alby explains that they know nothing about the Box or who sends it or controls it. On one occasion they tried to send a Greenie back through it but it would not move until the boy was removed from it.

The kid was sliced in half. If you remember from the book when Thomas finds himself in the dead-heads (graveyard) he finds a box with remains of the boy who was sliced in half from when he tried going down the box hole. However, none of the gladers know how this happened. It just came out of nowhere.

The kids are sliced to death and go to heaven sometimes or others the other place.