If the estate owed federal taxes I would be hard pressed not to deposit.What I find most humorous about the paper checks is that the envelope has a big box to check if the addressee is deceased, meanwhile the addressee was LISTED as [FN][MI][LN], DECD with the second line being "c/o [Initial.Last Name] where the C/O was the executor or executrix of the estate.
There is also language on the envelope about the crime if one forges the name of the recipient. HOWEVER...an executor or executrix is NOT forging the name of the deceased.
I speak from experience, having just received the paper check for my grandmother (after the direct deposit had failed since we closed the account about a year and a half ago when she passed away and we had paid the last of the bills).