Make a search query... select pages. Or use an imap client and use that to delete them.. (make sure you fix your settings for Archive/Delete... "All Mail" on I

Make a search query... select pages. Or use an imap client and use that to delete them.. (make sure you fix your settings for Archive/Delete... "All Mail" on IMAP is the worst invention ever) It's probably more reliable to create a new folder/label first.. And then delete them after you've done the sorting.