I agree with JacFSB. I'm assuming that we don't have all the details here, which makes it more difficult to try and comprehend.
Of the 12 CTRs filed, were they for cash in, or cash out? If it's a consistent cash in stream and all of a sudden you start seeing cash withdrawals, that is certainly out of the pattern although I wouldn't file on that alone.
Does the customer have a business need for the cash withdrawals (check cashing business, scrap metal buyer, etc.)? If so, enhanced due diligence would probably find that there was an influx in business due to season, time of the month, etc.
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CAMS