Minecraft wiki entry for Hiding_chests, associated text: A somewhat more unorthodox method for hiding chests is to construct a large storage room or warehouse filled with hundreds, thousands or even hundreds of thousands of chests (empty or filled with junk, the more chests the better) and then hide the valuable chest somewhere amongst them, in a more discreet location. Chests can be placed next to Trapped Chests without needing a block between them and both types can be placed on top of one another. While this is not guaranteed to protect the chest from looters it will definitely delay them for a good while, as every additional chest added will increase the amount of time it takes to search through them all and every passing minute increases the odds of the looter getting caught red-handed by the chest owner. Few players are willing to risk that by spending more than a few minutes rummaging through all the chests. And if anyone, despite that, IS crazy enough to actually start looking through all the chests, even if it takes them the whole day, the trap can be further augmented by mixing in some trapped chests (linked to redstone and/or traps) among the real chests, forcing the thief to waste even more time trying to tell the two types of chests apart from one another to avoid a nasty surprise. Finally, if you really want to ruin the thief's day, hide the valuable chest somewhere completely elsewhere; once the looter finishes rummaging through all the tens of thousands of chests (trapped or not), they will have to face the cruel reality that all their efforts were wasted for nothing as the valuable chest was nowhere to be found within the ridiculously huge chest heap.