Based on legal advice, at any time, if you lose any kind of documents, you must first register an FIR. As far as possible, FIR should be done by the owner of the property, if it is not possible then some other responsible person should do this work. State clearly the reason for the loss of documents. Then keep a copy of that FIR and keep it with you at the time of selling or buying the property. Make sure to advertise the lost papers in the newspaper, so that if someone else finds them, they can return them to you. After this, if your papers are lost in the flat, then based on FIR, you can demand a share certificate from society. Considering the FIR as evidence, the social issues a share certificate. Along with this, you should also ask for N.O.C as it is required in the transaction of property. Get the registration registered for the affidavit of the lost documents, for this also clarify the FIR number and the information given in the advertisement. Now take these documents to the notary and get them registered so that the affidavit becomes legally valid. Obtain Duplicate Sale Deed - To obtain duplicate sale deed, submit copies of FIR, advertisement, share certificate, and affidavit by the notary to the Registrar's office. A lot of money has to be paid for valid property papers and if the bank loses the papers, you can also demand damages. A registrar's office maintains archives of all property transactions of his authority. To obtain a copy of the original sale deed, the owner has to visit the Registrar's office. To get the copy, the owner has to pay the copies of the police complaint, newspaper advertisement, certificate from the housing society, and also the relevant fee. Thereafter, a copy of the original sale deed will be given to the owner. If the property is old, it is recommended to obtain an ownership report of the property document from the office of the Deputy Registrar