This might sound weird but if the user account of that employee has been deleted, try recreating it and then login using that account. Then you will see all the knowledge objects under their account. After that, change the permission of those KOs app/global. Logout and login as admin. Reassign those KOs to an existing/active user. Lastly, you can delete the user account of the resigned employee. OR, you can check savedsearches.conf in the backend and copy those which are under the resigned employee's account.
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