Can I freeze the butts?
Yes. In fact, since they are smoked so long and sealed in a 3 mil commercial National Sanitation Foundation certified plastic bag, they will stay good for several months.
Thaw them out either by putting them in refrigerator until thawed.
Or you can put them in the oven in a closed pan (roaster or a tented pan) and set the temperature between 180 to 200. Check with a thermometer to be sure the meat is at least 165 degrees.
If thawed in a microwave, you must warm them up to 190 degrees F.
They have been smoked for over 20 hours. They do NOT need to be cooked again.