I would file for structuring- 6 transactions =$48,000 in 30 days. Unless the customer has an explanation of why the withdrawals were made over 30 days. In the case like this i file and in the narrative explain where the funds came from- attorney settlement checks, retirement,disability. i also document what we know about this individual, how long they've been a customer and whether or not we think they are involved in any illegal activity, other than structuring. We're a small town and sometimes we know that our customer has withdrawn the cash to simply go down the street and across the street to purchase CDs from other banks. They just don't understand banking, CTRs, IRS, etc.