Or you can just use "Modify" button in the "Retrieve" menu to move furniture from one room to another (between exterior and interior as well) without "clipping magic".You can still move things, but you can not with draw them into your inventory. It is tricky to get furniture from one room to another in houses like Tel Galen, but if you shove them in one direction enough, they will eventually appear in the other room (be careful. If you lose the item inside the wall, you can only withdraw it but not place it again, since you reached your cap). Luckily the Autumn's Gate only has one room as far as I remember, so you should be fine ^^