Section 203(2) in Bihar Board's Miscellaneous Rules, 1958
(2)Numbering of locks and keys. - Every padlock shall have a number impressed upon it or attached to it by a metal or other label, and the same number shall be impressed on or attached to each key belonging to it. No two padlocks in the same district shall bear the same number. Every key other than those belonging to treasury strong-rooms or chests shall have a label attached to it showing what almtran or chests it opens.
