JMich: Any disc will work. If the disc+BIOS combo is correct, the activation process is bypassed completely (as in most laptops). If the disc+BIOS combo is incorrect, a working serial is needed, and Windows need to be activated (either online, or through phone).
Oh, sorry, I misunderstood bypassed originally. I thought you meant the BIOS may look for a specific disc and bypass installation if not found, but you meant it would bypass activation.
Okay, I get it now. Any disc would work, it's just depending on which one determines whether a valid code is required or not. Hopefully, the one available is valid.