Replacing a Logic board

I have a Kindle 2 that needs a new logic board, I have several methods where I can obtain a logic board so that is not the issue. What I like to know is which part stores the pertinent data that is wirelessly communicated to amazon when connecting to the kindle book store? The logic board or mini-PCI card? For instance, if I was to replace the logic board but use my current mini-PCI card would amazon still recognize my kindle as the kindle I currently have registered to my account? Or would I need to re-register? One of the main driving factors for this question is that I'm aware there are a lot of stolen/blacklisted kindles floating around out there. There are some modestly priced parts on craigslist/ebay. If the data that is used to verify the registered device is stored on the logic board it would be a waste of money for me to purchase the used motherboard and install it if it turns out the logic board comes from a blacklisted kindle. However, if the data is stored/communicated from the mini-PCI card I should have no problem replacing the logic board and use my mini-PCI.

Looking forward to your help/advice!