What I know and have seen with my eyes is that are private drivers with little vans that constantly travel between Europe and Africa to transport goods for a known network of people. Kind of p2p shipping. Hope he used one of those, because traditional shipping to Africa is probably not worth, considering shipping cost, taxed and all the controls and extra fees added when stuff cross borders.

For small quantities of electronic devices, like computers or hardware wallets, intended for personal or educational use in Zambia, taxes are generally not applied (some other African countries do impose duty on such items). Standard (non-express) shipping is usually affordable, but another practical approach is for the donor to sell the device and send the money to the recipient, who can then use it to purchase a second-hand device locally.