IRS Refund for a Deceased Parent

I filed (by mail) in late Feb 2026 a 1040 return for the portion of 2025 that my mother was living. The expected refund is in excess of $10,000, and will be a check. The return was in Mom’s name, c/o my name, at my street address. On March 10 of this year the residence at that address was destroyed by the tornado. So I have installed a new mailbox on my now-empty lot to receive mail there, as the Post office tells me that IRS / govt type things will not be forwarded but returned to sender. I have received the IRS letter, made the phone call, and have sent in (on May 29) the requested FORM 56, using the same home address, as I didn’t want to change the address for fear of further muddying the waters. In trying to call the phone number again to check if the form was received, I am told that there is a large volume of calls “in my subject matter, call back some other time” and *click*. If I go to IRS.gov and open an account, am I opening an account in my name, or in my mother’s name c/o me ? I have read your column on this subject and understand that the large (and uncommon for Mom) refund is what has flagged this return. Any help would be appreciated, as I need to change my address on my Drivers License soon, but can’t because I need to be able to prove that the old address is indeed my address for mailing purposes. By the way, my CPA just shrugs his shoulders.