Just to amplify one point here. The facts (1) that you are aware of check fraud, (2) that the amount exceeds $5,000, (3) that you have the identity of the/a suspect, and (4) that it apparently took place in an account at your bank make this a mandatory SAR case.
As pointed out clearly in the AmSouth public documents, whether the bank will sustain a loss is not material to the filing of the SAR.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8