It would be a good idea to show the count of new junk emails. In box emails have a count of all the new emails; I believe junk should also have a count. Sometimes users so not look at the junk folder to see if there are new emails and may miss an email that is important. If there is a new email count then it will prompt the user to check if the new email is true junk. The user could delete, respond, or move it as needed.