Procedure in case of losing the original copy of Hiba deed

My father given me 71 decimal land through Hibba (unregistered) in 1998 and then mutation was also done in the same year and the govt rent receipt also issued in my name which is till now continue yearly paid by me. In 27th july 2009 my father expired and original Hibba lost.My brother filed partion suit in patna civil court in the year of DEC 2009 and claiming Hibba property aslo. SIR, I lost the original Hibba paper somewhere and court is asking for the original paper.I have already submitted photocopy of Hibba and certified copy of Mutation paper issued by the local authority and original rent reciepts but patna civil court is not accepting the photocopy of Hibba. Kindly help me and give the guideline.