They removed them one or two months ago – they do this from time to time so as not to have too big a list (and because they want you to buy books from the approved publishers 🙂 )
They are still on the website – just not indexed. If you search in Google you should be able to find them (for example if you are looking for F9 for June 2008, then type in “ACCA F9 June 2008″or variations of it 🙂 )