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Is it possible to repair a corrupted custom toolbox?
At this time, there are no tools in ArcGIS for Desktop that support or repair corrupted custom toolboxes.
The best solution is to recreate the desired toolbox. Refer to the following link for more information: ArcGIS Help - Creating a toolbox.
To prevent future data loss, in the event a toolbox becomes corrupted, make a copy of the original working toolbox that serves as a backup. Refer to the following link for more information: ArcGIS Help - Copying toolboxes.