Try somehow going to their old office somehow? I don't know...
However, I do have their address! Try going to Google Maps and search "Audubon, PA" and you should see it as "CSG/MOS/GMT".
I hope this helps you somehow!
Then:
Now:
Also, you should see this: CSG/MOS There, it says that everything was "Liquified"
Also, davidmjc on the 6502 forum, said the he made a SVG blueprint of the 6502 Here.

