Welcome to the unofficial Boards of Canada wiki by Fredd-E. Here you will find information and analyses on the brothers various creations and themselves.
No, they aren't. Please read the first paragraph of the discography. Also copies of these albums were only given to friends and family of the band which implies that it is not possible to acquire them on the internet.
There is no such thing as A Few Old Tunes Volume 2. The tracks you downloaded however are most likely a collection of tracks from genuine BoC compilations; probably compiled from the following authentic BoC material: A Few Old Tunes, Old Tunes Volume 01 and/or Old Tunes Volume 02.
No, they are just a bunch of mislabeled mp3s floating around the internet. Please see the Discography for more information.
No, they are just normal lads like you and me. Please read the Interviews for more insights.