Coke has one of the best corporate archives outreach programs you're likely to run across actually, why don't you give them a tweet? They're @coke_archives. I don't know if they actually have any of the Good Stuff left, as that sort of thing was well before people were into the idea of corporate archives, but they do have preserved unopened bottles. It's relatively normal to have preserved products like this in corporate archives - since you're into drugs, the Lilly company has a very nice drug archives.

This is not really possible. The half life of cocaine is pretty short. They stopped using it in the beverage over a hundred years ago. So even if an old bottle exists somewhere, it would almost certainly not contain even trace amounts of actual cocaine.

I've found some of the old bottle pieces at the dump that the Chattanooga bottling company used. Though never a complete one, those have all been salvaged and sold.