When there is a mass deletion on DB (number of files or size of files), we get an email alert. The email gives you a summary of files & sizes the deleted and by whom at what time. When you click on link, it takes you to the Security page > Mass Deletion, listing all files deleted, but if you click the "Restore" button, it does not restore your file, it just takes you to the Activity page. I checked folders and no files were restored. You can do to the "Deleted Files" under the Home page and find them there, but the button on the page the email sends you to does NOT work.