I think I would like to make some changes to the above post. But as the thread had already been viewed by 3 people so I thought that I should add a new post.
I found the key to level two of BF in Act I. Apparately there are 2 keys to level 1 of BF.
I also wanted to mention that the trophy section is not updating properly. For example I killed Death Knights who patroled the citadel but they did not show up in the 'trophy' page.
