Forget them! All you need to show control of are those that are relevant to your established system like ongoing procedures, policies, SOP's and stuff like that and of course any records you generate during and after the implementation of your MS....So you might need to update a few things, grandfather them or whatever and then just pick up the ball and run with it...The stuff in the past doesn't exist nor is there any requirement that you bust you backside trying to fix those things.