law: Sale of Goods Act, 1930
  24. Goods sent on approval or "on sale or
  
  return"
  When goods are delivered to the buyer on approval or "on
  
  sale or return" or other similar terms, the property therein passes to the
  
  buyer-
  (a) when he signifies his approval or acceptance to the seller
  
  or does any other act adopting the transaction;
  (b) if he does not signify his approval or acceptance to the
  
  seller but retains the goods without giving notice of rejection, then, if a
  
  time has been fixed for the return of the goods, on the expiration of such
  
  time, and, if no time has been fixed, on the expiration of a reasonable time.