If the OC is scheduled to drop in November then the CA will too. They have to have the same DOFD.
From my experience, take the non return of the green card as a good thing. November isn't too far out to wait...but it wouldn't hurt if your mail IS returned, to make a copy of the envelope showing the attempted delivery to NCO and send that to the CBs stating that you have tried contacting said company via the address listed on your report and are unable to contact them.
Have you disputed the item on your report already? If so, then ask the CB to explain HOW they verified a debt that you cannot verify yourself
have you tried calling EQ rather than mailing? Many people on here seem to get better results by talking to someone directly. Just a thought
So what your saying is they moonwalked around your situation? Great analogy!