You probably will be directed to open the camera, extended it etc for X-Ray, even a touchy-feely if they are really curious/cautious. Advise the inspecting Officer about loaded film holders; the younger officers will likely not be very familiar with large format (or even medium format!). Proprietary wooden cameras (Ebony, Toyo, Wista) do not pose a risk; they are treated at manufacture, much the same as walking canes and wooden pens. But woe betide you if Customs opens the camera and out flies an exotic moth! Also expect to come in for attention if the camera is home-made of wood (with materials coming from another country).