Odd that this should have happened after I posted this but my 12 year old student had A glitch of some kind?? Not A pilot error, I think it was A bad switch but we will never know for sure.
No crash box but the RX had A good foam wrap. The battery was several inches behind the servos and RX. The plane hit on it's nose from A couple hundred feet and the battery knocked everything out in front of it. Would A crash box have saved the RX, who knows but it couldn't have hurt.
Like French said, it taint the hit as much as the weight of the hammer!!