In 2007, the British Columbia Civil Liberties Association and Amnesty International attempted to bring a halt to detainee transfers. The documents related to the resulting federal court case are here and the last link there is a massive file—nearly 1,200 pages at 227 MB—of documents turned over by the government.
Some of the memos and e-mails have been cited in recent media reports. Various portions are redacted. Richard Colvin’s name appears at various points, but it doesn’t appear that any of his 2006 memos are included.
Should you be so interested in such stuff though, there is plenty there to review.