Tyrell, don't forget to add The Troll's Tablespoon from a few days back.
The Thief's Final Coin
Muto Mentem 13 (Base 3, R: Touch, D: Concentration [Item maintains Concentration; +5], T: Individual, +3 for Penetration +6)
A penny cast from cheap tin doctored to appear as silver, adorned with the face of King John. When a person touches the coin without speaking the chosen magic words (which are often as simple as "Please" or "Thank you"), they find themselves wracked with guilt and paranoia whenever they think about having taken the accursed currency. The extra Penetration allows it to work on the edge of the church's Dominion, where cutpurses tend to dwell. The lab text for this item includes the slight bonus tin provides to enforcing law.
Cursed coins such as these have been minted as far back as the Order of Hermes' third or fourth generation. Their intended use is to shame a thief into giving their stolen goods right back to the victim, though the effect has no such specific instructions. When The Thief's Final Coin is lost in "the wild", it often drives bearers into hermitage or a new life in a monastery, if they don't turn themselves in and become outlaws.