I have volume 3 and 4 of Physics by Randall Knight. Both these books are needed for physics 212 at Boise State. I also have an unused gain access to code for mastering physics, which is needed for the class. I had a code that was still valid from in 2012 so I did not need the one which included this pack of books. as you can see from the pictures, the seal was never broken. if interested simply e-mail me your contact number and let me know if you like texts or calls.