law: 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.