I have stuff since I'm a prepper. I also have 0000 steel wool I needed to buff some white marks made by moisture, off a fine tabletop. If I remember right, the clerk wrote my name down and what I bought. I didn't find out until later that was because I could have made a gun silencer from that.
They can have the other stuff, but I refuse to give up my cigarettes. They cost too much to give them to a cop (who would probably smoke them).
Maybe, but steel wool that fine might catch fire.
I understand the copper colored pot scrubbers are supposedly on the list of things which can be used to reconstruct a suppressor, and if you have a bunch of those around, and a (legal) suppressor, people have gotten in trouble for having the materials to 'construct' one. (I guess you have to have another permit to put new stuffing in the one you have).
The rules are a minefield, which is why I don't fool with Class III devices.