The branch manager should conduct further investigation before taking any other action, as this activity may indicate possible money laundering or fraud. The branch manager should review the transaction records of the customers and the teller, and look for any unusual or suspicious patterns, such as large or frequent cash deposits, round amounts, structured transactions, or inconsistent information. The branch manager should also interview the teller and the customers, and ask them about the nature and purpose of their relationship, the source and use of funds, and the reason for choosing the same teller. The branch manager should document the findings and report any suspicious activity to the appropriate authorities, if necessary.
References:
* CAMS Study Guide, 6th Edition, Chapter 3, Section 3.21
* CAMS Study Guide, 6th Edition, Chapter 4, Section 4.21
* CAMS Exam Questions and Free Practice Test, Question 322