Definitely.. there should not be a star nut in there. That's not safe necessarily; even if it is, that's like buying a car with a muffler half off. It might never fall off, and it isn't noisy, but you know it's there and could fall off. Awful example, but you get my drift.

I dunno if they'll give you a new one, depends if they trust that you didn't put it in there.