While I am not 100% positive, I believe that you are able to (since you would, most likely, be selling to a collector/dealer. And, they would never even THINK about opening the boxes…let alone eating the contents. lol). I am VERY interested in finding out the answer to this, also. My late brother-in-law had a MASSIVE collection of old Wheaties cereal boxes…and, I have a sinking feeling that my in-laws threw them out when he passed away. 🙁
Thanks for asking about this. Have a great day.