The amount of $54 billion, which was $46 billion at the time, was not in a specific account, but it was simply an accounting entry, as you probably know. The consolidation of the employment insurance fund had been strongly recommended by the Auditor General of the day, Mr. Denis Desautels. This was a time when the Employment Insurance Fund was in a chronic deficit situation. So the Auditor General recommended to the government that the fund be integrated into the Consolidated Revenue Fund, and that the deficit be entered as a liability of the government of Canada, which the government of the time actually did. The situation changed afterwards, as the Employment Insurance Fund began to accumulate a large surplus. Since the successive surpluses were integrated and consolidated into the Consolidated Revenue Fund, they were not put into a separate account. So the $54 billion do not actually exist in a dedicated account.
On May 1st, 2008. See this statement in context.