Could be just me tbh.
I was searching for them and could find them sometimes, when I couldn't I heard a sound and within seconds it stated I failed. Took me 4 tries to get to the burger lvl.
Sorry, that it ruined your experience. It should be not so hard on the first level, and nobody before in comments doesn't report it.
Some tips that you could miss:
So, the main goal to patrol the rooms and try to find the thieves when they far from the hideout.
It didn't ruined it at all! I still had fun :)
Good to know about the short blackout, was wondering what blackout meant in the instruction and thought the short blackout was just some flikkering.
I did notice the box, it's a nice touch!
The same I thought about the footsteps as the short blackout/flikkering, that it was just a nice aesthetic