When a group of Nigerian criminals set up five phony accounts at BankBoston, they had grand plans of stealing thousands of dollars through a fraudulent check deposit scheme. As fate would have it, the bank had recently installed a deposit fraud detection system that sifts nightly through all transactions and flags suspicious deposits. In the Nigerians' case, it was an uncharacteristic $40,000 deposit.

Bank officials telephoned the bank where the check was drawn and were referred to the FBI, who helped identify four other accounts at BankBoston that the criminals planned to use to bilk the institution.

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