I'm pretty sure that's an Aphonopelma-could be either A. hentzi or A. anax. They look very similar, but the more reddish hairs on the abdomen(where they haven't been kicked off) suggest A. hentzi more strongly.
I'm not too sure how it was acquired. I purchased this little lady from my cricket supplier. One of his other customers traded it in for a little cash. I've got no ideas on the history of this spider at all All I know is, she doesn't eat much, is VERY calm and docile, and loves hiding in the log in her tank.