Solution
SharePoint Items may have a 'Copy Source' field that you do not see in the SharePoint List Item Page. However, there is a hidden field called 'Copy Source'. This field may be present and have a URL value if SharePoint finds a duplicate copy of this file or item. The tool will show 'Field: Copy Source' in the column "Field" to indicate this. If you navigate to the List Item, you will see a status message showing something similar to "This item is a copy of https://portalname/sites/hr/docs/policy1.docx (Go To Source Item | Unlink)"
This indicates the item or file is linked to a source copy. The tool is reporting that this source copy cannot be found.
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