This came out of a discussion on another post: https://answers.laserfiche.com/questions/205849/Administrator-override-to-delete-a-folder-in-Laserfiche-even-if-you-do-not-have-rights-to-all-child-objects#205861
But it seems like the search syntax for LFACE items are not in the support documentation for Laserfiche 11. It can be found on the support site in a PDF titled "Advanced Search Syntax 10.3.pdf", but doesn't appear to show anywhere in the Laserfiche 11 documentation.
It would be a good idea to have that updated to include that in the documentation.
Additionally, it doesn't appear that the LFACE search has an option to search for entities where the rights inheritenace has been disabled. That would be helpful to be included as an option, since that can be unchecked without any other rights granted/denied, so it doesn't show on the other searches, but can result in different permissions for that entry and its children.