how i can delete {37} mailbox

[schum]

hello,

my script had built cyrus add_user measures. Now I have got the 
following mailboxes

IMAP Password: localhost.localdomain> lm
user / admin (\ HasChildren)
user / admin / backup (\ HasNoChildren)
user / admin / Drafts (\ HasNoChildren)
user / admin / Sent (\ HasNoChildren)
user / admin / spam (\ HasNoChildren)
user / admin / Trash (\ HasNoChildren)
{37} (\ HasNoChildren)
{42} (\ HasNoChildren)
{42} (\ HasNoChildren)
{43} (\ HasNoChildren)
{44} (\ HasNoChildren)

localhost> sam (37) cyrus cyrus
setaclmailbox: cyrus: cyrus: Mailbox does not exist

how can I delete the mailbox ?

greetings schum