This is a strawman arguement
@PondJamesPond. I'm quite sure that Nikon does not maintain a list of lenses that are "supposed" to rattle, as if it is some kind of deliberate or accidental design attribute. Lets be realistic, the nice lady at the end of the line isn't going to put me or anyone else on hold for 25 minutes or even call me back, while she runs around a warehouse opening up lenses and giving them a good shake to satisfy this query. Why? Because it's idiotic at best.
The lens the OP is returning is no longer made by Nikon. If it is the AF version then it's been out of production since 1992. The AF-D since 2007. Mine made a noise and was fine. I have numerous lenses here, some of them Nikon brand, some of them that aren't which makes a noise.
@Derrel fired off a list of many lenses he owns that have a rattle to them. The fact of the matter is that some lenses do make a noise and are perfectly fine, irrespective of the OPs problematic lens. It is most likely out of calibration. The fact that the aperture mechanism may make a noise is completely separate and inconsequential.
Not trying to lambaste you here, simply countering your viewpoint which is most likely based upon your lack of experience of lenses. Some people here have been photographers for decades. Myself, about 5 years. During that time I have probably gone through at least 50 different lenses. Many of which made a variety of rattling noises. Only one was faulty. The front element on an 80-200mm f/4.5n which had come loose and was fixed in under two minutes. The aperture still made a noise but, the lens worked perfectly and was a beautifully sharp lens.