Minecraft wiki entry for Hiding_chests, associated text: WARNING! If you decide to hide your valuables within the chest heap, make sure you know where you place them as forgetting which chest holds the valuables means you have a really huge job in front of you to find the valuables again. Do not mark the valuable chest or make it look different from the others in any way as that renders the whole contraption pointless; this whole concept relies on hiding the valuable chest amongst countless identical ones.