Chests and large boxes each have a 10% chance of being protected by a container trap. If you apply, loot or kick open a trapped container, or use an unlocking tool to lock or unlock it, the trap will be set off. The #untrap command checks a container for traps, and will prompt you to disarm it if one is found. Unsuccessfully disarming a trap will also set it off. The type of trap on a trapped container is not determined until it is set off. Wishing for a “poisoned” large box or chest will create one that is guaranteed to be trapped.