According to Customs and Border Patrol agents, the knock-offs were intended for hospital workers on the east coast.
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The masks had 3M labels, but the company worked with agents to determine they were fake.
Agents believe the retail value of the masks was more than $600,000.
Because the masks are counterfeits, there's a good chance they don't work.
Authorities say half of all counterfeit goods that enter the U.S. originate from China.
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