Indian Post Office Act, 1898
63. Penalty for affixing without authority thing to, or
painting, tarring or disfiguring, post office or post office letter box
Whoever, without due
authority, affixes any placard, advertisement, notice, list, document, board or
other thing in or on, or paints, tars or in any way disfigures any post office
or any letter-box provided by the Post Office for the reception of postal
articles, shall be punishable with fine which may extend to fifty rupees.