Long term capital gain

Sir /Madam , Mr A acquired ancestral property through partition by virtue of Registered Partition Deed in the FY 91-92. The market valuation of the total property ( without partition ) as per valuation report by valuer was Rs 3,44,880 as shown in registered partition deed . The valuation Report has been misplaced . Mr A acquired HALF  of it by way of partition. He spends various amounts in renovating his HALF  share by spending around Rs 4,00,000 in FY 92-93. Rs 4,00,000 in FY 2001-02 as the property was old and in shambles.. But he does not have bills of construction material , labour and other expenses incurred in renovation . He sells this property for Rs 57,00,000.in the FY 2013-2014. He has not filed his income tax return till date . Can he claim cost of improvement which he had incurred in its renovation .He does not have documents to support that expenditure . Stamp Duty paid was around Rs2,50,000/- What will be his LTCG Liability if he files his return in FY 2015-16