I think it's just a Kodak thing, although I'd love to know the meaning behind it. I have these numbers too on 160NC, home-processed. Nothing like this on home-processed 400H, 800Z, Acros, Delta 3200. I might dev a roll of TMY tonight and see if it's the same.
My guess would be that it's something to do with tracking the packaging process. If dozens of rolls come back as defective with "these particular numbers" they can most likely determine when/where/who/how.