I'm pretty sure that whenever a provider gives you a vaccine they have to record the lot # and expiration date for that vaccine, so if you don't have that information check to see if your provider has that information. I used the old forms for my immunizations and all they wanted was the date the immunization was administered and my provider signed off on it. Since the old forms are still being accepted, if your provider doesn't have that info available you could just fill out the old paperwork and then fill out parts I, II, and IV of the new forms and submit everything and you should be good to go (that's what I did since I had filled out all the immunization paperwork with the old forms beforehand and it was accepted without any issues).