EAD and Proof of Status
Gentlemen,
The notice we receive from the Service Center (in my case TSC) with our EAD clearly says "this document is a proof of status."
As most of us ordinarily do, I filed for my EAD and AP with my I-485 at TSC (of course long time ago). I received my EAD in the mail with a letter explaining the EAD document, its regulations and use. In this letter there is a paragraph which reads "this document is a proof of status."
Good luck to all of us!!