you may approach with a request letter to the office where your property was registered earlier, through an advocate. The officials at the offices will inform the request of your's in the news declaring the request of you. As you did and could not lodge a police complaint (now also you cannot register a police complaint) your ADVOCATE MAY ADVERTISE IN ANY OF THE LOCAL NEWS papers regarding the lost of the original document. you should submit a declaration that you are the owner of the property and no lien on that. After, two weeks of time, the registrar will check-up his office records to ascertain your status with the land/property.
On payment of required stamp duty, the registrar may issue a duplicate registration document, with your legal heir certificate, that you have no further claimants for the property.