FinCEN doesn't have any identified high risk categories. The closest you will get to regulatory labeling today is customers which are designated as being "subject to expanded examination overview." They are identified in the BSA/AML examination handbook, but not every customer so identified is high risk. Any "high risk" labeling comes directly from your bank.
Identifying a customer as high risk and then recognizing it as an exempt person seems a bit illogical, but I don't believe it would affect the amount of documentation or monitoring involved. If you designate a customer as high risk they are going to get your maximum efforts in any case.
For a creature of statute, LLC, limited partnership, corporation, etc. evidence of existence can be obtained from the Tennessee Secretary of State's office.
In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.