CBP only operates at the border which are internal

At the border, CBP is authorized to exclude, detain and/or seize imported merchandise that infringes federally registered and recorded trademarks and copyrights and/or is covered by an exclusion order issued by the U.S. International Trade Commission. CBP publishes annual statistics of intellectual property seizures at www.cbp.gov/ipr. This information includes the number of seizures, the domestic value, and the Manufacturer’s Suggested Retail Price (MRSP) of the goods.

CBP is domestic

CRS 21 [Congressional Research Service. Legal Sidebar, “U.S. Customs and Border Protection’s Powers and Limitations: A Primer”, November 30, 2021, https://crsreports.congress.gov/product/pdf/lsb/lsb10559#:~:text=U.S.%20Customs%20and%20Border%20Protection%20%28CBP%29%2C%20a%20component,international%20border%20and%20at%20U.S.%20ports%20of%20entry.]

The Homeland Security Act of 2002 established CBP as the component within DHS mainly responsible for protecting the nation’s international borders through enforcing federal customs and immigration laws (CBP also enforces other laws relating to the border, including those concerning the introduction of harmful plant or animal species and public health requirements). CBP’s customs powers derive from those originally exercised by the U.S. Customs Service of the Department of the Treasury, while CBP’s immigration enforcement functions derive from the former Immigration and Naturalization Service of the Department of Justice. Within CBP, the Office of Field Operations (OFO) conducts inspections and enforces immigration and customs laws at designated ports of entry. A separate CBP component, the U.S. Border Patrol, is responsible for the apprehension of non-U.S. nationals (“aliens” under federal law) and the interdiction of illegally imported goods entering the United States between ports of entry