I think his threat is empty. He is just trying to use it so you would give his SD back before he leaves thinking you will cave be all "OMG, please don't sue me! How about I give you the SD back, no questions asked even if you fill the place with a families of rabid raccoons and poop and we call it even?"
He is moving out of state. Is he going to hire an attorney, pays the attorney fees plus the travel fees to go back and forth to court? For a picture of a bed and dresser that he knew of? And to boot he only has an objection to the bed and dresser and not his living room furniture? I am assuming you told him you were gonna come over and take pictures of that apartment and arranged a time for that to happen, so he would have been there and seen it happen.
Also, I think he is confusing his "law" facts because I think you only have to have permission to post a picture of a person if the picture was taken in a private home. I don't think it extends to inanimate objects. I could be wrong.