Q: Two of my movies are missing from my Purchased list, and they are still on iTunes. Can anyone help?

If they are the same copies that you bought (e.g. the rights-holders haven't replaced them with new versions), and you haven't changed countries since buying them, then check to see if you've hidden them from the purchased link : iTunes Store: Hiding and unhiding purchases.

Do the films have a release date on their description page in the store ? If not, and you are sure that you bought them on the same account (and they were digital redemptions from a DVD or Blu-Ray) then you could try contacting iTunes Support and see if they can help with why they don't show for redownloading :  http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page, then Purchases, Billing & Redemption