Holley Rebuild Kit

Hey guys,

I'm sure someone here has used a holley rebuild kit before. Just wondering that if when you guys got it the little brass filters were dirty looking/had black stuff in them. I have a 670 street avenger, and got kit 37-935 to rebuild it. But the filters look dirty. Patches and little spots of black on them. I attached a couple pics. Is this something to worry about? Should I return the kit and get these replaced? Or is that some part of the filter and how they are and its fine?

Thanks guys!