All of our items are authentic. You can regroup your batches in a single shipment. Cost of certified shipping 6 EUR (SPAIN). We also offer International shipping from 12 EUR+ (Better to ask first)All shipments are made in a padded envelope and the pieces are sealed for greater safety during transport. If you have any questions or need clarification about any piece you can contact me and I will try to respond immediately, to give you the best service.