Try submitting a claim with the Toronto Pearson lost & found office: https://app.nettracer.aero/lf-pax/gtaa/report

The main page for the office is https://www.torontopearson.com/en/wh...d-found-office

I have no first-hand experience with this, but they have responsibility for locating items lost in the terminal so they should be able to help find your bag (esp. with the Tile pings) and arrange return shipping. Good luck, I hope it works for you. Please let us know if it did.