Beekeeper Denise has submitted this article on uses and storage of old comb.
Blog editors comment: Used comb can be overwintered in Wisconsin by storing it outside; either in a hive box or an unheated storage shed. The typical cold weather in Wisconsin will kill off any wax moth larvae. The main thing is to prevent mice from getting to the comb. This can b done by placing the comb in their respective size boxes. Make sure both the bottom and top of the boxes are covered (sealed) with a a piece of wood and plug any other holes with a cork. I store all my comb in unheated sheds using this method and have not had issues with wax moth larvae or mice.