In one case I took a limited POA authorizing me to act as an agent on the individual’s behalf. I received enough info to determine it was worth doing an ancillary probate to secure the claim. In another, I had POA for my grandmother and was filing to recover some funds due her. I inquired about another claim involving my mother who was also listed as having POA over my grandmother. Because of this connection, I received enough clues to determine where it came from and to allow my mother to bring the correct documents to handle it.
If you take a certified probate order, filed certified Memorandum of Trust, POAs, Death Certificate listing informant as an apparent heir (child-sibling), etc., I think you’ll have some luck getting a bit of info. In one case I posed the question that the owners would incur $4-5K in expenses if they continued. Would the benefit outweigh the cost? They will likely need to process them before you’ll get full info.
I really believe it is for fraud prevention more than anything. All of my direct interaction was 4-5 years ago. Some of the indirect feedback has been in the last 2 years.