462. Punishment for same offence when committed by person entrusted with custody: Whoever, being entrusted with any dosed receptacle which contains or which he believes to contain property, without having authority to open the same, dishonestly, or with intent to commit mischief, breaks open or unfastens that receptacle, shall be punished with imprisonment of either description for a term which may extend to threeyears, or with fine, or with both. . CHAPTER XVIII OF OFFENCES RELATING TO DOCUMENTS AND TO TRADE OR PROPERTY MARKS 463. Forgery: Whoever makes any false document or part of a document, with intent to cause damage or injury, to the public or to any person, or to support any claim or title, or to cause any person to part with property, or to enter into any express or implied contract, or with intent to commit fraud or that fraud may be committed, commits forgery. 464. Making a false document: A person is said to make a false document. First: Who dishonestly or fraudulently makes, signs, seals or executes a document or part of a document, or makes any mark denoting the execution of a document, with the intention of causing it to be believed that such document or part of a document was made, signed, sealed or executed by the authority of a person by whom or by whose authority he knows that it was not made, signed, sealed or executed, or at a time at which he knows that it was not made, signed, seated or executed; or Secondly : Who, without lawful authority, dishonesty or fraudulently, by cancellation or otherwise, alters a document in any material part thereof, after it has been made "or executed either by himself or by any other person, whether such person be living or dead at the time of such alteration; or Thirdly: Who dishonestly or fraudulently causes any person to sign, seal, execute or later a document, knowing that such person by reason of unsoundness of mind or intoxication cannot, or that. by reason of deception practised upon him, he does not know the contents of the document or the nature of the alteration. Illustrations (a) A has a letter of credit upon B for rupees 10,QOO, written by Z. A, in order to defraud E, adds a cipher to the 10,000 and makes the sum 10,000, intending that it may be believed by 5 that Z so wrote .the letter, A has committed forgery. (b) A, without Z's authority, affixes Z's seat to a document purporting to be a conveyance of an estate from Z to A, with the intention of selling the estate to 6 and thereby of obtaining from B the purchase-money. A has committed forgery.