I don't see the big deal on the ghost kit, you have so much crap to do for inspection that not using a soap dish, toothbrush, razor and shaving cream are only 4 little things. If you cut those corners with the ghost kit it is not going to make your bed that much better or your shoes shine that much nicer or your creases in your shirts that much sharper.
Most instructors know people have them.
I hated cleaning my hair brush in basic and having to pick out all those long hairs so yes I had a GHOST hairbrush in my personal box. It was not hidden and if and when they looked, I said yes I have 2 hair brushes and that was the end of it. I did not throw it out or hide it somewhere else. I did clean it, but not the 100% of what an inspection hair brush would look like. I suppose if I'd had 100 gross linty hairs in it they might have said WTF but it was clean. Also I had an extra toothpaste and shaving cream can and razor. Again it was not hidden and I did not lie when it was found in my personal box.
I think if you LIE about it your really in crap, point is don't lie and go out of your way to hide it because then it looks like your out to deceive them. If it's found deal with it and move on. If they say get rid of the so called ghost kit then get rid of it.