The nature of a courier delivery network means the services are not suitable for fragile items like glass, or valuables that are on the prohibited list and that may benefit from a more personal service. It is designed for well-packaged, clearly labelled items that need to reach their destination quickly and with a proof of delivery. In the same way you would not send an open envelope full of cash through the postal system, you would not send a porcelain doll through a courier network.
How to properly package your shipment
How to correctly label your shipment