https://www.cbp.gov/trade/basic-import-export/export-docs/motor-vehicle
"The certificate of title is the core requirement in the Customs export process..."
"A person attempting to export a used self-propelled vehicle shall present to Customs, at the port of exportation, both the vehicle and the required documentation describing the vehicle to include the VIN "
"For used, self-propelled vehicles issued, by any jurisdiction in the United States, a Certificate of Title or a Salvage Title that remains in force,
the owner must provide to Customs the
original Certificate of Title or a Certified Copy of the Certificate of Title and two complete copies of the original Certificate of Title or the Certified Copy of the original."