Tinker traps
A tinker is capable of trapping any lockable box.
There are 3 types of traps that tinkers can craft. These include poison traps, explosion traps and dart traps. Of these 3, an explosion trap is the strongest and even a lesser explosion potion will suffice to kill nearly any player who opens the box. This assumes the tinker is at the Grandmaster level.
Any type of lockable boxes can be trapped, including dungeon chests, treasure map chests and boxes created with carpentry.
The tinker is directly responsible for any harm incurred by the box, unless either of these conditions are met: the harm comes from snooping, or the harm is done inside a house that the tinker is at least friended to. In these cases, it is not the tinker's responsibility if harm is incurred. Otherwise, the tinker faces normal notoriety penalties when a player is harmed by the box, including the possibility of receiving a murder count.