Long term capital gain.

mizbah khan (student IPCC) (98 Points)

05 July 2015  
(Assuming) My father purchased a piece of land from dda in the year 1981 December. COA was Rs.12,000/- further he spent around 25lac for construction in the year 1985, 1990 & 2000. The same property. Was sold in the year 2014 for Rs. 1.4 cr. After applying the indexation there's a capital loss. Income Tax Return for the same has been prepared. Now my question is there is no physical proof of the cost of construction or improvement done to the property. COI was calculated on the rough estimate of the cost incurred. Will the department send any notice or ask for the documents for COI? Or is there any other intricacies I should know??? Please help in the matter.