Yes, buyer will buy your property though you will have duplicate copy of the land documents because that copy will be issued by the registration office of your area. To get the certified duplicate copy of the document you have to go through following procedure:
1. file the compliant to nearest police station about lost of property documents. Get the copy of FIR
2. give public notice in the local news paper. Here, you have to take help of any local lawyer for preparing public notice.
3. apply to concerned registration office for certified duplicate copy of the document. Attaché your identity proof, FIR and some other old documents proving that land is owned by you for eg. Electricity bill or water bill etc.
Do not worry. If you have lost your original documents then you should make a police report. You can get a copy of FIR and then you can apply for a duplicate copies of the land documents. If your land is in the municipal limits then you can obtains TS-1 certificate from corporation. Otherwise you can visit to the Patwari of your land (area). He can give you a copy of Furd. With this you can get easily the duplicate registration of the land.
With best regards
Tips for Healthy Life