These are some pictures that I picked up from a company that I used to deal with. I didn't know that they were fake because the description said they were sheepskin etc. It turned out that they were cow skin instead. I still see some of this pictures on eBay.
First and foremost, u need to  know that UGG Australia Classic tall & short boots are made in China, NOT New Zealand as in this first picture:

I still see sellers that have USA addresses that sell Classic Short & Tall Boots that are made in New Zealand. So, don't be fooled by sellers item location.
Here are other pictures that I occasionally see on eBay that are fake UGGs, claiming  to be real:
1. Classic Tall Black Boots


2. Camel Tall


3. Chestnut Short

Always ask sellers where their boots are made in according to to the tag inside these boots. 40% of the sellers that I asked, said their boots are authentic UGG Australia boots, but they are not.
I simply asked, "Are your boots made in China, Australia OR New Zealand?" 40% said Australia.
They might be sheepskin boots, but they are not UGG Australia's.

Here are some more pictures of fake shoes from USA sellers. They look like a genuine one, but these are made in New Zealand.


An eBay user recently asked me a question  about the authenticity of these boots:


She was wondering if these are authentic because these choco boots have brown heel tag instead of off white. Also the sole is black.
I couldn't really tell from the 2nd pix because it's kind of dark.
But the heel tag in the 1st pix should be off white. I haven't seen any authorized UGGS dealers selling a chocolate boots with brown heel tag. I haven't heard that they have been updated to that either. But I know that Chocolate boots now have dark brown sole!

I'll add some more pictures next time.
Till then, please mark my guide as useful if you fine that it is.
Thanks!

..... DOING IT     for.the.children