Millions of counterfeit masks have been seized by Customers and Border Protection (CBP) officials since the start of the pandemic. But the last few months have seen an “exponential increase” in counterfeit mask seizures, a CBP official told CNN.Millions of counterfeit masks have been seized by Customers and Border Protection (CBP) officials since the start of the pandemic. But the last few months have seen an “exponential increase” in counterfeit mask seizures, a CBP official told CNN.