All Ugg labeled boots for sale in Beijing, except at the above listed authorized store, are
counterfeit.

Here's a good guide to determine authenticity.

http://reviews.ebay.com/HOW-TO-TELL-...00000003850686

There are decent quality boots available at a good price, just have
to inspect them and make an educated guess. Sticking a one cent
Ugg label on the back gives the merchant a possibility of selling
at about 5 times what they would get without it.