[Part 1]
Canadian Lawfag Here:
A "sealed indictment" is an artifact of the Grand Jury system, which was abolished in Canada decades and decades ago, out of concern about political interference in due process in criminal prosecutions, and yet also (somewhat ironically) preserved in the United States out of concerns about political interference in due process in criminal prosecutions.
Consequently, there is no such thing in Canadian Law as a "Sealed Grand Jury Indictment" in the sense discussed in the Qnverse, and catalogued in those posts about the mind-boggling number of such that have been slowly accumulating in the USA for the last two or three years (Durham, Huber investigations, etc.).
So, in a sense, you are asking the wrong question.