My father's brother and sister (both unmarried) had quite a few accounts and FDs/lockers jointly between them. Accounts are in SBI, PNB, Indian Bank, BoI, etc. My father has already acquired a Letter of Administration from the court as a proof of him being the only legal heir. However, when we are in the process of submitting our claims to the different banks, they have been asking for Indemnity Bonds/sureties, Original FD Certificates, Passbooks of Savings Bank Accounts along with the Letter of Administration. The issue we are facing is that we do not have all the original FD Certificates or the Passbooks of the Savings Bank Accounts. Since my father's brother expired suddenly while my father was at my place being treated for a major disease, my father's sister having expired an year before due to a prolonged illness, most of the Certificates and Passbooks had been misplaced. Under the circumstances, I would like to understand whether it is a valid requirement from the bank when they ask for Original Certificates/Passbooks or Indemnity Bonds/Sureties when the legal representation is already available.