The World's Largest Game Store! With over 13,000 sq. ft. of display and gaming space, the Sentry Box is a Mecca for those interested in fantasy, science fiction, or military games, books and miniatures. The policy of the Sentry Box has always been "If it's in print, we'll try to stock it." With over 46,000 different items on the shelves, this shows that we mean what we say.