Section 695(26) in Police Regulations, Bengal , 1943
(26)The duplicate keys of the Chubb's locks which are in use for the record-room doors of the officers of Collectors are to be placed in a sealed packet and handed over to the officer-in-charge of the treasury guard. The sealed packet will be examined once a week by the record-room Deputy Collector. The Registration record-room keys may be similarly made over to the police guard, in which case, the sealed packet will be examined once a week by the District Sub-Registrar. But except as provided for below no officer-in-charge or constable of any guard shall take charge of the key of any strong-room, safe or receptacle in which treasure is kept.