pb4uski
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Brokerages should receive red flags such as returned mail, untaken RMDs, etc. Whether they then act upon such hints I do not know.
I suspect that for returned mail they would presume that you moved and failed to update your address rather than you died. I'm not sure what they would read into untaken RMDs - perhaps neglect or oversight.