Do not move the .avb bin into that folder. Just don’t do it. It should not be there, so you should keep it out of there.
The first thing I would do is to open the Media Tool (under Tools), and have it display master clips for all projects on all drives.
That way, you should be able to confirm that the media you are looking for is actually there, and actually visible to the Avid.
Then, if it is, open the bin that should contain the footage you want to use. If the clips still appear offline, select all and choose Clip->Relink, and uncheck the box to only relink to footage for the current project.