Now tell us what happened.  We don't see many pension checks around here lately, the banks being more reliable with direct deposit than the Post Office with political shortcomings.  Were these from the same former employer, issued before the decedent's death and just not cashed?  Or did they keep sending checks until the death was reported?  But then why would the estate be entitled to the money?  Or were there three separate pensions, and each of them is paying a pro-rated amount for the final month?  Usually the executor / personal representative can cash those with a deposit to the estate account.