Probably Kansas City Service Center, which I don't think has reopened.  Ogden opened partially a few weeks ago, and is making progress on 1040 returns -- so probably 1041s, also.   I would not have stopped payment on checks.  It's not that difficult to keep up with the news on what is happening at IRS, at the federal government, and around the country and world.  As mentioned, now IRS is going to cash both checks, charge a penalty for the rejected one, and take time away from helping the rest of us to sort out the mess.