I got up to the point where I needed to find a post-it note that is stuck to a monitor - I checked every single lab after the de-contamination room, but just couldn't find it. I found a few post-its that had a few instructions on them, but they were not legible.
I don't want to know exactly where it is (as that takes away the fun) but does the post-it stand out (have a glow around them?) and would they spawn before the de-contamination room? (am I expected to back travel quite far?)