I had a similar situation crossing the land border with my family at Lewiston/Queeston back in the spring when RAT testing was still required to return. I uploaded the results to ArriveCAN, made our declarations, and were welcomed home with no request to test on arrival. 3 days later I received an automated call saying my arrival test was never received - just me, not my wife or kids.

A few phone calls later, I was directed to send an email outlining the circumstances. I received a response from a human telling me all was good.