Best strategy here. Bury your valuables under a mountain of drek. Someone who is dead set on breaking/entering/stealing will be difficult to stop completely. However, only someone who really knows what they're looking for, and knows your inventory, will be likely to get away will all the good stuff. And after digging through all the fodder and lifting and sifting through dozens of long boxes, they're likely to throw out their backs in the process. Also, don't forget the insurance. There are several companies that specialize in collectibles insurance. It's not that big an expense if you have a significant investment of your net worth in your books.