I know people can be quirky but I've never heard of burning things unless it's photos and things related to an ex as some form of symbolism. Paper shredding not enough? I usually just tear old bills up. This could even be Carter playing up the "Wiccan" angle for his own benefit.
One year in uni we were thrilled to have a fireplace in our apartment; as soon as final exams were over, we would get drunk and burn all the notes we weren't keeping.