Your examiners are nuts. Tell them to reread the examination manual - page 66:
"The decision to file a SAR is an inherently subjective judgment. Examiners should focus on whether the bank has an effective SAR decision-making process, not individual SAR decisions. Examiners may review individual SAR decisions as a means to test the effectiveness of the SAR monitoring, reporting, and decision-making process. In those instances where the bank has an established SAR decision-making process, has followed existing policies, procedures, and processes, and has determined not to file a SAR, the bank should not be criticized for the failure to file a SAR unless the failure is significant or accompanied by evidence of bad faith."
If you identify these transactions and come to a conclusion that while unusual, you have no reason to suspect that it involves money laundering, terrorist financing or other illegal activity - then to criticize you for not filing is ridiculous.
Kick this issue up the line. A finding like this in a report is going to have severe consequences in future exams if they find anything legitimate, because additional findings in future examinations require further actions, such as cease and desist orders.
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