I was in a Chinese drywall house today, before any rehab was done.
The pictures are on my FTP site, (use your back button to get back to index)http://gfretwell.com/ftp/Chinese%20Drywall/
I will make up some HTML when I get a chance but these are the pictures if you want to browse.
Basically anything covered was OK (including under screws). Brass and copper was affected, steel and aluminum didn't seem to be. You could get the black stuff off the wire with your fingernail. Note the bus bars and lugs in the panel look brand new. (aluminum alloy)
Plumbing fixtures took a hit as did a set of brass keys hanging on the wall.
This house was abandoned at final trim and sat empty for well over a year.