Lost emails while transferring to IMAP - What can be done?

Hello everybody.
I'm running 10.8.2 and Mail 6.2.
I have a collection of old emails (90K ish) that I recently imported to local Mail storage.   It took me a while to do some sorting but finally got my emails into a few folders.
I wanted to upload the mails to my current IMAP server.   I started uploading folder by folder.  As you can imagine it takes a while.  Folders were of various sizes 1K - 10K emails in size.  Most of the time everything worked well.
At one point, as I was uploading (moving) about 5K emails I noticed that the upload took a very short time.  I wasn't completely sure it had in fact finished and uploaded everything or it was a partial upload. I wasn't paying close attention so I wasn't sure if they emails were moved.  The local storaged didn't seem right, the emails didn't appear to be there.  Not all emails appeared in the IMAP folder either.
It appears (though I'm not 100% sure) that at some point my internet connection had died and that killed the upload.  But the upload wasn't cancelled correctly and now the emails didn't appear at either end.   
I checked afterwards with a copy of my unsorted emails and in fact some emails were missing.
I haven't lost any data, I have all the emails in the original storage.  However, they are not organized and I have no easy way to know which emails are missing on imap.  Probably 2-3K emails are missing out of 90K (not in a simple range like date).
Question:  Anyway, before I re-do all the sorting work and start uploading thousands of duplicates while I waste hours cleaning things up I was wondering if there is a log of some sort that Mail keeps with these sort of transactions.
Also, I wanted to give a warning to people performing these sort of tasks that you might lose emails if you're not careful.
Thanks,
CL

If you don't trust the syncing via mail, you can check and verify the IMAP account on the server with some form of webmail, depending on the ISP or server host. If nothing else is available, this site should work.
On your Mac, Mail might indeed think that the move had been finished successfully and deleted the mails locally.
If they are not on the server, then you'll need to get them from the original storage.
With activity like this, it's always better to split up the load into more smaller packages. Uploading 5000 emails at once is risky, IMHO...

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