The reason this category uses a courier is custody rather than speed. The customer wants one named person holding the box for the whole journey, a numbered seal applied in front of them, and a photographic record they can check on arrival. Every extra handover is a place where the story gets harder to tell.
01Declaration is the other half. High-value goods are declared properly and insured to the declared value, and the paperwork has to match the goods exactly. Understating a value to save duty is not a service; it is a liability transferred to the customer.
02Discretion is operational rather than theatrical: unremarkable outer packaging, no branding, and a route that does not advertise what is in it.