How to distinguish the Eleaf iStick's authenticity

If you bought Eleaf iStick from anywhere, first,you should distinguish whether you bought the original eleaf istick! and how to distinguish?
OK,You should find your security code card from the eleaf istick box,then open scraping coating to see the security code .And enter them on page http://www.eleafworld.com/info/batchcode.php, and click "QUERY" button.The Conclusion will tell you if your eleaf istick is original.