law: Sale of Goods Act, 1930
  27. Sale by person not the owner
  Subject to the provisions of this Act and of any other law for
  
  the time being in force, where goods are sold by a person who is not the owner
  
  thereof and who does not sell them under the authority or with the consent of
  
  the owner, the buyer acquires no better title to the goods than the seller had,
  
  unless the owner of the goods is by his conduct precluded from denying the
  
  seller's authority to sell:
  PROVIDED that, where a mercantile agent is, with the
  
  consent of the owner, in possession of the goods or of a document of title to
  
  the goods, any sale made by him, when acting in the ordinary course of business
  
  of a mercantile agent, shall be as valid as if he were expressly authorized by
  
  the owner of the goods to make the same; provided that the buyer acts is good
  
  faith and has not at the time of the contract of sale notice that the seller
  
  has not authority to sell.