I took a look in zmprov. It looks like that folder is already empty.
gaf
Code:
prov> sm *************
mailbox: *************, size: 6.52 GB, messages: 77978, unread: 9937
mbox *************> gaf
Id View Unread Msg Count Path
---------- ---- ---------- ---------- ----------
.....
7 cont 0 0 /Contacts