Call the landlord and explain to him that you are not sure where he's located. If you can get the directions, ask him if it's okay to come over and get the key. Advise him that you want to start moving your stuff over this week so that you don't have all of it to do next weekend and besides...you never know what the weather will be.

If you have his full name, you can do a ZabaSearch.com and locate him that way. I know you are starting to feel like the walls are closing in, but you've got to turn every stone to get to this landlord. Evidently he's not one of those who responds to his messages very quickly.

Once you begin moving your belongings, you'll be able to walk thru the house and see if you've left anything behind. Right now, I'm sure you've got boxes everywhere while packing.

Breathe!

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.