I can see why a government might sign a concession agreement to get a company to operate in their country when no domestic company can offer the services. However, I cannot imagine a country hiring a foreign company to manage its borders!
It seems like a country might be more likely to sign a concession agreement with a company to sell some kind of cutting edge technology in their country. Or a concession agreement with a company that sells medical supplies or provides a medical service. But to manage the ports and borders? I'm not sure that makes any sense!