I had some concerns because after the deliver people left I moved the unit (still in the undamaged box) and heard rattling inside metal. I called the GE Store and they offered options but I needed to load the unit on a truck in two days for a move from NH to FL. Thankfully upon arrival when I connected the cord and vent hose I learned it was simply extra screws from assembly in the unit. 
The product is excellent, works great, very very easy to use, highly recommend but GE must make sure all loose pieces are removed please!