I personally think that it is a good idea to update records to obtain significant information such as a missing TIN, DOB or ID. The primary purpose is not necessarily to determine the identity of the customer, but rather to have info we may need for other purposes, such as filing CTRs, MIL records. Having basic identifying information on file can streamline service and documentation procedures (especially in an automated environment).
That being said, we identified potential CIP issues through the process. When pressed for ID of individuals depositing payroll checks for years, we were given bogus SSNs in a number of situations. That definitely made me question whether we had accurately identified those individuals at account opening. Could other information provided by these persons, including names, be fictitious as well?
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Life without Jesus is like an unsharpened pencil - it has no point.