You really need to get some reference material if you are going to buy items without posting them first. That being said, I have been seriously collecting for about 6 years and I still cannot tell the difference in most EK's without searching and doing some research first. As an example, Greg even said that this one fooled him at first and he is quite knowledgeable in this field. If you are going to seriously collect EK's then you need to buy one or two, (at the least) books. Either that or you need to find yourself some reliable, reputable dealers to frequent that will offer refunds if the items turn out to be bad, not Snyder's Treasures. Also, you can find items here in the classifieds that would increase your chances of obtaining original items for your collection.
Hope this helps,