All I can say I did it at Ambassador Bridge myself for my wife ( PR ). I did export with car's Title on her name and the officer just asked my US passport and I had with me all emails related to 72 hours notice. No question asked about owner of the car ( my wife who was already in Canada and was not able to enter USA to do the export). It took 10 minutes and at the end I got the Title stamped, left the office and proceeded on this car to over the bridge to Canadian side to do import. There I went to Canadian Immigration office with all Canadian paperwork - stamped title, RIV form, and a copy of Goods to follow form. Another 15-20 minutes, again no any objections to import the car by relative, filled all paperwork and that's it. Next day went to local Service Canada office to get car registered/plated in Ontario. This time, of course, they spoke "only" with car owner - my wife (PR). Her Canadian DL, proof of Canadian insurance, filled RIV and Immigration forms, stamped Title - and got registration and plate.