If it is a joint return, I would give the 1099INT to the joint owner to include on their return and tell them to fix it so it doesn't come again under a deceased SSN.  If there is no joint owner, then it should go on Form 1041.

I think the 1099R is a little more complicated.  If it is from a pension in which the payor was never notified, then once you notify them and return the money they will issue a corrected 1099R.  This is not a claim of right situation.

If it is an IRA RMD, then it should go on a 1041.  If it is from interest earned on excess insurance dividends, then it should go on Form 1041 and you have now found another policy from which your bill can be paid, including the client grief and aggravation charge you should tack on.