Are you sure it says shipped on April 15th? Ir does it says Date Placed: April 15th? If it's the later it's just the day you made your order, it has nothing to do yet with the shipment day, the status changes like this:
Order Placed-> Awaiting fulfillment/Payment -> Completed -> Order shipped
If your order is still on the completed stat it just means they received your payment and you should get an email soon with your tracking number ( give it a day, since right now is around 2:00 AM in Hong Kong).
After you get your tracking number again, be patient, I've read many customers from Europe got their products pretty fast, but It took 5 days for me till my tracking number showed up on the HK post service and another two for it to left HK.