Hate to say it, but you might not be able to get your things back. I accidentally left my favorite sweater at a friend's house a few years ago and contacted her several times about getting it back. I even sent her a check for the cost of shipping it to me (she lived 3 hours away). Never got the sweater. Never heard from her again. I guess she liked my sweater more than my friendship.
Good luck! I hope your story has a happier ending than mine.