Nathan has a website you can go to and type in your VIN and it will tell you how your car was built. I forget the site address. Edit: I found the thread for you. http://www.motoringalliance.com/forums/mini-stuff/19242-how-your-mini-equipped-factory-tutorial.html#axzz2sV71Mcov
A "package" is just a set of individual options available at a slight discount if purchased together from the factory. What's included in a particular package may change from year to year, and to my knowledge MINI only has records of the individual options not packages.