Original Copy VS duplicate Copy

Hi Experts, Need your help. My friends dad is having two properties(A&B) and two sons. He expired with out a WILL and both his son shared the property(A to elder and B to younger) through partition deed. In the partition deed it was written that original will be with elder(A Property ) and duplicate with younger (B Property) one. Now the elder brother is selling his property and handling over the original copy of the partition deed to the buyer. Will the younger have any issues with elder giving the original doc? Please advise.