Have you called the airline? Chances are, the passport will be found by someone honest and returned to a Canadian government office. That said, if it has not yet been found, you shouldn't wait to report it missing.

http://www.voyage.gc.ca/faq/passport...rts-eng.asp#10

If LA police won't give you a report (as it appears to have been lost between YYZ and ORD), call the Consulate General at 213-346-2700 and seek their advice.

http://www.canadainternational.gc.ca..._id=253&menu=L

It might not be a bad idea to call them first thing, anyway, and see if they have any specific advice.