Minecraft wiki entry for Things_not_to_do, associated text: If another player finds someone's secret stash of goods, there is a good chance for these items to be stolen. If the player wants to hide a stash of goods, the items should be well hidden and possibly even defended with traps. Or even better, use an ender chest as other players are unable to access it. Putting the items into shulker boxes and bringing them around is also good, but other players can still steal them if they kill the player.