The evacuated building houses major financial institutions, including Merrill Lynch, Nomura Securities, Deloitte, Commerzbank and OppenheimerFunds Inc.
A Nomura Securities spokesman said that one of the company's employees was responsible for bringing the fake explosive into the building and that that person was being placed on administrative leave, pending an internal review.
Police said it was determined that the package had been ordered by an employee, who told investigators he bought it from an Oklahoma City-based mail-order company that specializes in U.S. Marine Corps novelties.
Police said there was no threat, and no criminal investigation is taking place.
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