They were among folders of papers shuffled around by Ludlow in the deleted Board Room scene, and Hammond during his scene with Ian Malcolm in his bedroom office. I always assumed they were blank papers because we never see them shown up close on screen, but it seems the prop department went the extra mile. That's something I love about the Jurassic Park movies. The devil is always in the details.
The paper props weren't the only thing done that way. Todd Marks, who did the computer animations for The Lost World, released the full animation he did for the Marksmann GPS. It includes a lot of material never seen on screen. He also privately released the full animation he did for Hammond's laptop in the aforementioned Hammond office scene, but I've yet to see him give anybody permission to release it publicly. There's been a ton of archival material unearthed in the past year or so, and I have little doubt that the announcement of the "Ultimate Visual History" book being released this October isn't connected.