I also have a feeling it may not be new. I asked the seller to post more pics and he just did.   Though it could be a clean but used unit.   One way to tell is to lift up a few keys and see if there is any hair/gunk on the metal under the keys (I let them know this). 
The short F122 cord in his photo appears to be well stretched out like this was used a while. 
Light dust or scuffs may not mean it's used,  as it may have sat on a shelf in the open before it was boxed and shipped.