Once every few hours, a chest will be sent. Until it arrives at its destination, chest can be improved by earning "Order Points" . If the cargo has arrived and you see the "Open" button, then the sending of a new chest will not start until you open the current ready one. Only one item can be obtained from the chest to choose from (it is then sent to your inbox), all other objects go to the next "Storage" field. You can pick up the rest of the items from the storage in exchange for coins. Also note that if all 9 storage cells are filled with objects, as shown in the screenshot below, then new items from new chests will either replace the current resources in the storage (if these are more valuable and rare items), or new resources will disappear.