[Dovecot] stupid migration from maildir+ to dbox

[Vasiliy G Tolstov]

Hello.
I'm install latest dovecot 1.2 from hg repo. I have many messages in
maildir+ format. I migrate some folders to dbxo format using
instructions from http://wiki.dovecot.org/MailboxFormat/dbox.
But in two folders i'm delete index.cache and index.log files, this is
my mistake.
Is that possible to recover this files (regenerate) or use my messages
from maildir with dbox?
Thank You for any tips and help.
P.S. Thank You for best e-mail software!