Usually a piece of equipment used for food would not even be sold as used like new if it were actually used. Usually means open box, or even just a damaged box.
An exception may be a Keurig or such where you cant tell if it were used once or twice. I suppose a hot plate (and maybe even an urn) would be in the same category. But I can not imagine a crock pot or pan being sold as used like new if it where ever used.