Had the same problem, went to my neighbor told him that my package disappear i have filled a refund on amazon and im gonna call the police, since then i have no problem.
your solution
1) speak with your roommate, tell him that your package disappear and that you might call the police.
2) Call canada post so you can subscribe for the " incoming package delivery" when you receive an SMS go straight to your home put a chair and stay there untill your package arrive.
dont know about the PO sorry.