When using BoxItem.Info itemInfo = BoxItem.getSharedItem(api, sharedLink); to retrieve basic information about a shared link, Box returns a 404 when the admin/co-admin doesn't have specific permissions. However, it's possible to see the basic information when you view a shared link report. We're essentially trying to get the same information as the shared link report is able to pull for all files/folders. Discussion of the suggestion is here:
https://forum.box.com/t/add-ability-to-discover-basic-file-information-from-shared-link/2494