I can usually track down EIN requests to a bank teller with a GED.  How long has this trust existed?  Are the people who wrote it still around?  Are they somewhat competent?  Sometimes they used to be bank tellers. 

This is a good article to start with:

https://www.naela.org/NewsJournalOnline/News_Articles/2019/JanFebMar2019/TaxSNT.aspx