If the attorney was worth his or her salt, the trust will have a "Certification of Trust" that the client provides to us. It lists the legal name of the trust, names of the trustees, what TIN will be used, and has everyone's signatures. That's all we really need, anyway. We keep a copy with the account agreement docs.
...And with CIP, the trust document (or certification of trust) becomes the trust/customer's identity documentation....
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Just a lowly 1st Year Law Student ("1L"), so don't take anything I say seriously!