No Person claiming under any Deed or Instrument by which any Sale, Enfranchisement, Exchange, Licence, or Grant shall be made or purport to be made under the Authority of this Act shall be bound to inquire whether the Provisions of this Act have been duly complied with or not, or whether such Sale, Enfranchisement, Exchange, Licence, or Grant has been in fact authorized by this Act or not, or whether it has or has not been within the Provisions and the true Intent and Meaning of this Act; but every Deed or Instrument by which any Sale, Enfranchisement, Exchange, Licence, or Grant shall purport to be made under the Authority of this Act shall be good, valid, and effectual, as against His said Royal Highness, His Heirs and Successors, for the Purposes for which the same shall have been executed.