Commenters suggested that FinCEN require a more meaningful promise than "Hey, as far as I know, these dudes own the company." They also suggested that the signature be notarized. FinCEN rejected both ideas.
Your examiners will suggest "enhancements" that increase the amount of wasted effort you put into this regulation. This will be one of them. Don't enhance your workload as a volunteer...
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.