As I'm not sure about what type of activity you are talking about, I'll offer a general response to a general question. This comes from a 2003 FinCEN slide presentation:
Where did the suspicious activity take place?
* Identify the branch/department location or locations within the institution where the activity occurred (name of branch, office or department and the street address for each)
* Identify all account numbers & types of accounts affected by the transactions/activity
* Indicate if suspect transactions involve other domestic or international banks & identify the banks, their locations, account numbers, etc.
The slide show is out of date because it was not based on the FinCEN SAR. However this piece of advice is far more easily incorporated into the FinCEN SAR than it was in the legacy version.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.