We do not have data on the by-elections. What we know from the labour force survey, which is a high-quality survey done independently by StatsCan, is that about 152,000 Canadians were unable to prove their identity and address during the last election, and 50,000 were turned away. For most of these electors, the voter information card would be of great assistance.
On May 22nd, 2018. See this statement in context.