Sorry to hear that happened to you. It's a serious matter and Nook Press Admin, should track the perpetrator(s) down via their IP address if at all possible, especially since they could strike again!
First time I've ever heard of that, and it's a crime.The stole your copyrighted material, and in order to get an account here they probably lied about their information to boot.
For information about reporting copyright infringement to Barnes & Noble, please reference the instructions on this page: http://www.barnesandnoble.com/include/copyright.asp
The NOOK Press Team