You're trying too hard to stretch things. The situation is not about taking ownership of the pages, or copying the pages, it's about making a decision based on the pages.
So you could be the first person to break the news of my amazing new invention while I am filing the patent, or something. I might be disgruntled but it's my fault for leaving the netbook there.
It's not like you'd be able to patent something you didn't invent without tremendous piles of fraud.
So I will just email myself a copy of your work and patent it before you can.
No harm then right, it is just a copy.