"No results found" when ancestor ID entered
I'm helping a friend check why some family details have disappeared from FamilySearch. She has an FOR from which cards were printed 15 Aug 2012. Anthony Joseph Nearmy, LZ8S-D8Q was on the list with his parents, his wife and her parents, and they are all on FamilySearch EXCEPT his parents. I understand that all sorts of things can happen because of merges, but no changes for this period show. Anthony's parents and IDs are Assad Nearmy, LZ8S-83V and Mary Bealta, LZ8S-8LN, but searching with these IDs produces no results. Is there any way of checking what happened to these details?