by TeckXKnight » Sat Jul 19, 2014 5:24 am
Generally when this happens it's because someone was able to squeeze through a hole in your wall, such as if you're using cliffs as part of your walls. Other instances involve people breaking your walls via ram and then repairing them afterwards to dodge suspicion. Check for scents around your walls.
Sometimes, though rarer, people hand out crossroad signs to people that they trust and then get robbed via crossroad.
Find their point of entry and examine clues from there, that'll tell you a lot. You'll be able to find their point of entry via tracking and trespassing scents.