You should really contact your local police department. They can rattle the cage of local pawnshops and second-hand dealers. It might be a long-shot, but it has been known to work. I realize that this may have happened up to eight months ago, but you really don't have anything to lose by reporting it. If it did pass through the hands of a pawnshop or second-hand dealer, they may have records identifying the person who sold these items to them and the person who bought them. Most municipalities have ordinances requiring these kinds of shops to keep records.
