You're correct that Mr. Verchere was on the board of the Swiss Bank Corporation. And you are correct in saying that he was Mr. Mulroney's tax lawyer and that he handled his blind trust. Mr. Verchere's own banking and the money he dealt with was usually done in Geneva at Pictet or Darier Hench, two other banks.
On February 14th, 2008. See this statement in context.