Once and it was a dumb mistake. We had an old gas stove, no pilot light, I let him slip away from me and when I grabbed him he was hooked to something and I didn't want to pull to hard. I knew he was in the stove, I took it apart, but still couldn't get to him. I waited for half and hour then there he was hanging off the top of the stove

Other than that no escapes, they are in tubs in a home made rack so there's no way they can open a lid.