In the wake of a CBC investigation that revealed thousands of immigration applications had been assigned to hundreds of former employees' IDs and placeholder codes, the federal government conducted a major review and cleaned up its system to ensure none had been "forgotten."
source https://www.cbc.ca/news/canada/ottawa/ircc-stopped-assigning-immigration-applications-to-inactive-officers-ids-after-cbc-report-1.7314310?cmp=rss