Provided also, and be it further enacted, That whenever any of such Possessions or Land Revenues of the Crown as aforesaid shall be fold and disposed of by the Commissioners for the Time being of His Majesty's Woods, Forests, and Land Revenues, under the Authority of this Act, with the Approbation and under the Authority of a Warrant from the Lord High Treasurer or Commissioners of the Treasury, or any Three or more of them for the Time being, issued for that Purpose, the Purchaser or Purchasers thereof shall not be bound or required to make any further Enquiry, whether the same were or are saleable under the Authority of this Act, or into the Powers of the Commissioners in making such Sale ; but every such Purchaser or Purchasers thereof, having ascertained the same to have been fold under the Authority of a Warrant from the Lord High Treasurer, or the Commissioners of the Treasury for the Time being, or any Three or more of them, and having obtained such -Certificate as aforesaid, and paid the Purchase Money therein specified, and procured the Receipt of the Cashiers of the Bank of England, or, one of them, for such Purchase Money, and having enrolled the said Certificate and Receipt with the Auditor of the Land Revenue within the Time and in Manner required by this Act, shall hold the Premises so Purchased by him, her, or them, and shall have free, quiet, and peaceable Possession and Enjoyment thereof, and shall not be liable to be thereafter disturbed under any Pretence or Pretences that the Estates, Possessions, or Revenues To fold and Purchased by him, her, or them, were not saleable under the Powers or Authorities of this Act, or any other Pretence or Pretences whatsoever.