This seller has been mentioned many times on this thread, and many different DIS'ers have had dealings with her. All of the replies and those who received pins from this person reported receiving scrappers. There were some who had one or two "authentic" pins in their lot, but approx 95% were scrappers.
In fact, one person on this thread attempted to question the seller regarding the authenticity and this seller replied very rudely and other nasty things happened.
I went back and looked at her auctions again, looked at feedback (since some posters said they left it) and can confidently state that you bought scrappers. This person really is a piece of work. I looked at the negative comments, all indicating fake pins, and she tries to ruin their credibility by posting replies. I also had to laugh out loud when reading the descriptions indicating that she doesn't sell scrappers because hers are not in a little plastic bag. I'm fairly certain this seller is reading this and/or other threads on the DIS to post this information on his/her listings.
Basically, you get what you pay for; it's true in all areas of life and is true in this case. I would love to see you inquire about the authenticity of the pins with the seller and see the response. It's up to you to decide how you handle the situation from here. But I would urge you to "do the right thing" and not trade them @ Disney. As stated in this thread many, many times, it hurts everyone and the entire practice of pin trading is diminished.
Thanks for taking the time to ask questions!