If the I.D. information is the only thing missing, I would file then amend once the customer came back into the branch.
You may have done this already, but I've found someone's ID (more than once) by reviewing checks that cleared the customer's account. At some points of sale, when the customers write a check, the cashier's document the DL number. It was tedious going through checks in the system, but on more than one occasion has been helpful.
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