Just reading these replies makes me feel better. I have had most of the thoughts I have read here.

The parents are really good friends of ours. I don't want to mess that up for my spare SLR.

They had to know. How could they not know?

I would love to know what happened, but rolling down the stairs would be consistent with the bruising.

I hadn't thought about the disposable nature of things for kids that age, but that makes sense. I routinely shoot cameras from the 50's, 60's and 70's that I baby. I would think an item of such heft and substance would inspire a teen. I am living in a dream world.