regenerate quota files

[ram]

We us a cyrus imap server(2.2.3) , with maiboxes created by a
perl-Cyrus-Admin script. Which creates mailbox and calls setquota() for
every mbox


I have sometimes seen that the quota files are not created / go missing
for some mailboxes at random.  Is there any way I can debug why this
happens ? 


Now If on a live mailbox the quota file is missing , How can I
regenerate the quota files


Thanks
Ram