Make a police report, & keep a copy. I believe the 11B replacement process is still done at CMPB, although the payment is at the DTTB next door (MINDEF cashier)? In any case, call your unit (the phone number is in the letters they sent you) prior to see if they can do the paperwork for you. If cannot, ask them where to bring the police report to. You can also email CMPB to inquire about this.