After hearing so many talk about how Rice Chex bother them (as they do me), I finally wrote to the company. They do indeed contain corn. So those of us with corn intolerances had best stay away from them. Here is what they said:
Dear Ms. XXXX:
Thank you for contacting us concerning Rice Chex cereal. We appreciate the opportunity to address this matter.
The Mixed Tocopherols ingredient contains a corn ingredient.
If you have any further questions or concerns, please let us know.