Junkboxes Needed

My rogues need to hone their lockpicking skills, and I need locks of adequate difficulty -- the stuff Zan makes us is unfit for all but the lowliest neophytes. Tell ya what, if you bring me 5 Heavy Junkboxes, I'll provide you with some of the finest throwing knives known to roguekind. You can unlock the boxes and rifle through them, but you'll have to leave at least a few coins in them... even a rogue in training needs motivation.