Precious Metal Trader JM Bullion Acknowledges Breach. In a notification letter filed to the Montana Department of Justice, precious metal trader JM Bullion has revealed that an unknown amount of customer information. Data Breach Notification , Fraud Management & Cybercrime , Incident & Breach Response. In a notification letter filed with the Montana Department of Justice, precious metal trader JM Bullion has revealed that an unknown amount of customer information has been compromised in a data breach that appears to have occurred during a five-month period earlier this year.