Errors from cyr_expire on non-existent mailboxes

I'm seeing the following:

Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: IOERROR: opening index failed: mailbox=<Nuser.philipp> error=<System I/O error> syserror=<No such file or directory> func=<mailbox_open_advanced>
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: unable to open mailbox Nuser.philipp: System I/O error
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: IOERROR: opening index failed: mailbox=<Nuser.philipp.#splitconversations> error=<System I/O error> syserror=<No  such file or directory> func=<mailbox_open_advanced>
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: unable to open mailbox Nuser.philipp.#splitconversations: System I/O error
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: IOERROR: opening index failed: mailbox=<Nuser.philipp.Apple Mail To Do> error=<System I/O error> syserror=<No such file or directory> func=<mailbox_open_advanced>
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: unable to open mailbox Nuser.philipp.Apple Mail To Do: System I/O error
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: IOERROR: opening index failed: mailbox=<Nuser.philipp.Archive> error=<System I/O error> syserror=<No such file or  directory> func=<mailbox_open_advanced>
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: unable to open mailbox Nuser.philipp.Archive: System I/O error
Apr 23 04:45:00 mail cyrus/cyr_expire[277603]: IOERROR: opening index failed: mailbox=<Nuser.philipp.Archive.bust> error=<System I/O error> syserror=<No such file or directory> func=<mailbox_open_advanced>
...

And I'm wondering where it's getting this list of mailboxes.  Also, how to regenerate the list of mailboxes correctly that it wants to iterate over?

Thanks,

-Philip


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