Purchase of land

Simply If you Follow Seller than no advantage recd.,But Afterwards You Can Suit By Authorities.Than True Disclosure Done

My Question is whether i can claim full amount in purchase value or i must resist with Regirtry amount..?

registration amount only would be your white investment, and lateron you will face music of evasion of stamp duty 

Thanks for your suggestions. As U S Sharmaji said that we have to pay stamp duty on black portion. If I pay all stamp duty at the time of registration on White and Black portion. Than can i claim full amount as purchase value in my books.What are the consequences for seller ( Agriculturist in Rural area)