how do you delete a VIP mailbox from the mail app?

What if all messages have been deleted previously?

From Mail help:

Make a sender a VIP

To keep track of messages you receive from especially important people, make them VIPs in Mail. You can have up to 100 VIPs.

• To make someone a VIP, move the pointer to the left of the sender’s name in the message header and click the star that appears. You can also move the pointer over the sender’s email address, click the arrow that appears, and choose “Add to VIPs” from the pop-up menu.A mailbox for the VIP is added to the Favorites bar. For example, if you make Dad a VIP sender, his messages are displayed in a VIP mailbox titled Dad.
• To remove VIP status from a sender, click the VIP’s star in a message. The star is removed and the sender’s VIP mailbox is removed from the Favorites bar.

If a VIP has several email addresses in Contacts, messages from any of those addresses will appear in the VIP’s mailbox.

If you use iCloud Contacts, your VIPs are available on your other Mac computers that use iCloud Contacts and have OS X Mountain Lion installed.

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So to remove a VIP mailbox, you would have to remove all its people, and then exit mail.

Maybe this will help:

https://discussions.apple.com/thread/4150825

I finally figured out that if you select a VIP name while holding down the control key, you can then select delete from the drop down list to clear it off of your VIP list. What a pain though...

Thank YOU!