First, I am not sure I understand what a FDICIA source document for business accounts would be in the first place. FDICIA compliance is based on internal risk assessments of critical functions and then the establishment of proper controls. So, it might depend on the risk and the mitigation factors you have identified.
If you just mean - is this business who they say they are, then that would be based on entity documents that can be confirmed as filed with the State.
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