Out of curiosity I ask, why do you need past papers prior to Dec 2010? There have been lots of syllabus and format changes and 12 sessions (June 10 to Sep 15) give you enough questions to practice.
Anyway, if you didn’t know, P4’s examiner was changed after June 10, so all papers before Dec 10 are somewhat a waste of time. Still if you want to enhance your knowledge, its good enough 🙂