We don't send customers used or refurbished systems. However, we get this question a lot. Here's why:
The screen's interface has a thin plastic film covering it. This film is easily marked up and difficult to notice the edges. Please remove the film from the device interface when you unpack the system and you will see a nice shiny display without scratches.
We do quality assurance on systems by testing them in water. This can cause "plating" on the water sensor, which some people mistake as rust. It's simply the collection of mineral deposits on the sensor.