dovecot - Mar 2014 - cyrus2dovecot and doveadm search,expunge

hi list,

i'am doing a migration from cyrus ( 2.1.17 ) to dovecot ( 2.1.7).

for mailbox migration i'am using this script : 
http://cyrus2dovecot.sw.fu-berlin.de/

To migrate a mailbox :

/usr/local/sbin/cyrus2dovecot.pl -C /data/migration/spool/%h/user/%u -D 
/data/mail/foo.bar/%u at foo.bar -U /data/migration/flags/%h/%u.sub -S 
/data/migration/flags/%h/%u.seen test

Directories
/data/migration/spool
/data/migration/flags

are rsynced with

rsync -av --delete ... .... ....

After mailbox end to migrate, i want to search all message savedbefore 
some days but this don't work

doveadm search -u test at foo.bar mailbox inbox savedbefore 1d

i'm sure this mailbox have mail before this days.

ls into mailbox dir:

-rw-r--r-- 1 siadmin siadmin   21662 Mar  3 15:54 
1393858496.R2cdf6e55Q2902.server.foo.bar,S=21662,W=22160:2,a

I don't understand why this message isn't printer by savedbefore 1d

what i'm doing wrong

thanks

-- 
Ronan Lanore