If you can identify a suspect, the $5,000 threshold for filing applies, even if your bank experiences no loss, because there has been an attempt to defraud the bank or to use the bank's accounts fraudulently.
If you cannot identify a suspect but a pattern suggests a single scheme or scam that accumulates to $25,000, file for the same reason.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8