adding new messages to prior hypermail archive

I archived some 460 messages from a mailbox with Hypermail 1.02 about 3 years ago. Now I want to use hypermail 2.03b to process a new mailbox and add the messages to the prior archive. I've tested 2.03b on the new mailbox, and it works fine when I give it an empty directory in which to create a new hypermail archive. However, when I point it at the directory with the prior 460-message archive, it changes the date stamp on the index files to today, but it doesn't append the 65 new messages to the archive.

As far as I can see, the default behavior is supposed to be to append messages to an existing archive. I'm not using the -u or -x flags. Suggestions?

thanks,
jmm

-- 
Prof. Jeffrey MacKie-Mason       http://www-personal.umich.edu/~jmm/
Dept. of Economics                                     jmm_at_umich.edu
   and School of Information               +1 (734) 647-4856 (voice)
University of Michigan                     +1 (734) 764-2475   (fax)
Ann Arbor, MI 48109