The agency says all registered political parties have been informed that 822 special ballots cast by electors in 74 electoral districts across the country were left with the returning officer in the riding of Coquitlam-Port Coquitlam.

Elections Canada says the ballots should have been returned to its headquarters by April 28 at 6 p.m. to allow them to be counted.

Elections Canada says an initial analysis shows that the outcomes in those 74 districts were not affected by the mislaid ballots.