You weren't required to submit proof you completed the course? If not, I don't know how they can prove you did or didn't complete it.
No idea about Canada. In some jurisdictions if it was a court ordered course the attendance sheet is submitted by the course provider and as a VERY low priority it is checked. Might never have time to check, might get lost, might take 5 years, might take 20.
Every once in a while someone gets all motivated to collect old fines, court costs, etc and the find and issue nasty legal stuff.
Given how nice Canadians are probably never happen.