The well-known releases that followed after the duo were signed, first to SKAM and then to Warp Records, which can be purchased in any decent record shop.
The releases which precede this, of which original copies are exceptionally rare. Much of the knowledge we have of the latter is due to The Cosmic Crofter's webpage, which is now defunct.
The exceptions: copies of Boc Maxima and the "Old Tunes" tapes which are almost certainly legitimate are readily available on the p2p networks.
These older items are NOT AVAILABLE; only friends and family of BoC have heard them.
In addition, three extracts of genuine old tracks came from a BoC-related website that no longer exists. They are: "Duffy" (0:24), "Wouldn't You Like To Be Free" (0:56), and "Circle" (0:35). "Duffy" is a gentle and innocent track, similar in theme to "Melissa Juice"; "Wouldn't You Like To Be Free" features massed guitars; "Circle" features slowly-changing high-pitched glacial tones, fitting the Alaskan theme of the album it comes from.
A number of track titles, listed below, returned by a BMI Repertoire search for "Michael Sandison" do not appear in the track listing of any known BoC or Hell Interface release. However, in most cases it is known what they refer to.
Boards of Canada's old website disappeared in 2000. Some fans managed to capture music loops that played on the site, many of which were simply Boards of Canada fiddling around, but some early works later became full songs. A 15 minute YouTube video surfaced on August 1st, 2011, containing all the loops on the site, and is embedded below.
Fake tracks purported to be by Boards of Canada have been prevalent in online spaces related to the band since the early 2000s. Initially most of these fake tracks were simply mislabelled tracks by other artists such as Múm, but in more recent years there has been an increasing prevalence of intentionally-made fake Boards of Canada tracks. The quality of these tracks and their similarity to authentic Boards of Canada varies widely, with many more recent fakes becoming ever more sophisticated in their approach.
Fakes have been labelled in a variety of ways; some use the titles of known early Boards of Canada tracks that are publicly unheard, others use made-up 'BoC-esque' titles, and others are presented as having unknown titles, the latter often as compilations similar to the authentic Random 35 Tracks Tape. As a general rule, any purported Boards of Canada track claimed to be from the unheard pre-1995 releases (see above) is most likely fake, as is any track not included on any of the releases listed on this page.