I just saw your question now. I had a look at those newspapers from Canton Wallis. It seems, most appointments were made by the Orphans' Office - then they were made for a widow. These were the most cases I found. I also saw one appointment for a married couple - don't know why. And one for a man living in another Canton and his legal guardian became his son, also living in the same town. In this case it is mentioned that all "Gläubiger" (creditors) should send their claims during the following 42 days to the "Richterstatthalter" (I can't translate this properly, but it's not the legal guardian).
Hope this helps.