Cooler Master ships the Masterbox NR400 in a plain brown box with an image of the chassis and details in multiple languages on the rear. You will also find the enclosure's specifications and another shot of the front of the case.
Two thick Styrofoam spacers hold the chassis in place, and a thin plastic bag has been applied to protect it from fingerprints and scratches.
Besides the required set of screws and some zip ties and HDD rails, Cooler Master includes a magnetic dust filter for the top and a Molex to 3-pin fan header adapter, which allows you to connect up to three cooling devices to a single Molex connector of your PSU.
A basic but functional manual is included in the box. It is especially helpful when it comes to identifying which screws are needed where and gives you some details on the liquid-cooling possibilities within the NR400.