This same thing actually happened to me.My bf got something out of the freezer and the cat must of slipped in and he closed it back without seeing her in there.We looked everywhere for her even driving up and down the road callin for her and walking around the yard with a falshlight we even looked under our house and in every place in the house EXCEPT the freezer.We gave up and I was a crying mess went to get some ice out and there she was curled up in a ball she was fine came out meowed like nothing was going on.