my dead copy of Fast Eddie (pics for the curious inside)

so I've only had 3 dead 2600 games since I first started collecting...
oddly enough 2 of which being Mountain King (which I've both since turned into geocaches, so they're gone)
and the 3rd being Fast Eddie.

That being said, I've only ever opened up 3 2600 games...
Not sure if this is normal, or if this is what caused the game to be non-working...
but there is a metal cover over (sorry, not very technical here) part of the chip..
Now, I wouldn't say it's oxidizing/getting rusty..
But it's definitely lost a good portion of its "shine"
The metal piece just looks old.

I tried everything...
and by everything, I mean lots of q-tips and rubbing alcohol over the whole chip, several times...
that's about the extent of my knowledge and what I can do.

anyone got a diagnosis as to why it doesn't work? (I bought it used and it never worked while I owned it)
Ideas of what to do with it? (now that it's been opened and the end label has been ripped due to that, and obviously the screw hole now)

pics:
http://i48.tinypic.com/24g4u4g.jpg
http://i49.tinypic.com/25tvn9u.jpg
http://i49.tinypic.com/2z7n0c4.jpg
http://i50.tinypic.com/14pclj.jpg
http://i50.tinypic.com/2wphvn5.jpg
http://i48.tinypic.com/2qvh0mx.jpg