Seizures of counterfeit products at U.S. borders have increased 10-fold over the past two decades as e-commerce sales have boomed. The total value of seized goods - if they had been real - reached nearly $1.4 billion in 2018. Most are coming from mainland China or Hong Kong.

CNBC visited one of the busiest entry points in the U.S. to get a glimpse at the influx of fake products and to find out what authorities and companies are doing to stop counterfeiting.

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