@edfoskey, let’s assume that you did indeed Export your RW 6 site, as Doug suggests.
That means that RW took the pages’ content from your project and ‘published’ it locally. Usually, in versions prior to 7, this has been so that you can see what your site will look like (e.g. by dragging the top level index.html (etc) file to Safari on your local machine).
It doesn’t affect your Project File (what you refer to as ‘Container’).
One way to find that RW 6 Project file would be by launching RW and having it ask you if you want to resume working on an existing Project. It’s likely that one of the Project files which this dialogue offers you will be your ‘missing’ Project.