I'm not sure what SN is unless you mean Seriel Number - I have looked ALL over this container and booklets for one and have yet to find one. And I honestly don't remember ever entering anything when I played. I've looked online and haven't found where it mentions it either, have looked in various forums and googled it
I did find out if it does need a Key Code you can normally get one free online or most likely you can use it twice - maybe you can find it better than I could! But all items are with it.