I think they have done a good job of describing the options that examiners should find "acceptable" in the revised examination procedures:
5. Review the financial institution’s internal controls and determine whether its documentation to evidence compliance with section 314(a) requests is adequate. This documentation could include, for example the following:
• Copies of section 314(a) requests.
• A log that records the tracking numbers and includes a sign-off column.
• Copies of the cover page of the requests, with a financial institution sign-off, that the records were checked, the date of the search and search results (e.g., positive/negative).
• For positive matches, copies of the form returned to FinCEN and the supporting documentation should be retained.
Although it is obviously permissible, I would discard the first option, keeping copies of the lists, for a variety of reasons.
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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.