If you merely purchased an existing loan, rlcarey is correct, CIP does not apply. (It doesn't make any difference if the seller is another bank or whether the lender did or did not apply CIP.)
The audit comment to Califgirl is simply a red herring. If the bank buys loans, CIP does not apply. If the bank allows another bank to perform CIP on its behalf then it very obviously is not buying the loan, it's making it and CIP applies.
If you participated in the underwriting of the loan and made your own underwriting decision then you are not purchasing the loan, you are funding it. CIP applies.
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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.