Well here it is this is what has happened so far.
I emailed the guy and asked for the dock etc. He was very apologetic, and sent me all the missing accessories. They all came and we both exchanged positive feedback. So this assures me that it isn't a stolen phone. They actually got a new iphone 3G hence the reason for selling this one.
However I am not going to use the card, I am just interested in how long AT&T leaves these active - since they give you a new sim when you get a 3G phone.
To this day, it still works, although I have only tried it to use the edge internet, no phone calls or texts.