Unless there is new media, there is no need to bring any media back. Anything rendered can be rendered again back on the original station. I would just make new bins from the work you’ve done on the second station, copy them to the original project (with MC not running) and then launch project, open bins, and all media relinks. Render as needed.
If you added new camera originals on second station, then just bring those over to the first station and copy them to one of the numbered folders in the Avid MediaFiles/MXF/ folder structure.
Michael