My order is still showing in-progress. So most likely they are shipping these in a batch. Apple is using UPS World Ease. On UPS site description says >>
Simplify customs clearance by grouping several shipments destined for one country or the entire European Union into a single shipment. This contractual service is available throughout North America and in select countries in Europe, Central and South America, Asia, Africa, and the Middle East. Each UPS World Ease shipment:
Actually, Apple is using UPS' Worldwide Expedited service. World Ease is just a part of Worldwide Expediated that means that customs clearance becomes easier. IMHO.