if u use any commercial method of coming back (air/rail/bus) the company will probably not let you board.. i will be surprised if they did let u board with no TRV or work permit.. the work permit letter is not an official letter so it doesnt count..
im not sure about the ferry.. but if u take your private car to the Canadian border on your way back, they may let you in.
im not sure about the ferry.. but if u take your private car to the Canadian border on your way back, they may let you in.