Have you looked into your backup folder? You can set up Media 100 to do backups of your bins as well as your timelines, so if that is turned on on your system you should be able to find the backed up bins in your backup folder.
On the other hand, I think I never had a corrupted bin with Media 100. The only time a bin would not open was when there was a damaged media file in this bin. Have you tried to open the bin with your media files offline (e.g. create a new project and open the bin in this project with "relink media" turned off)?