... my 9 year old son decided for some reason (that he still can't articulate) that it would be a good idea to turn the fridge/freezer where it was kept, off, and 'forget' to turn it back on until Daddy smelled something coming from the basement. I was virtually speechless. That was a very very good thing.....
That truly sucks, I agree with him helping clean it out.
That said, if you have a home security system it is a small expense to have a temp sensor installed in the freezer and have it connected to your system so that you'll get a call if it gets above a certain temperature...cheap insurance with hamburger at $5/lb. The newer/better ones have a delay built in so you can sift through the meat with the door open and not get a false signal.