Where can I find the key to the safe at the ATU? (STALKER: Clear Sky)

First, tell me what kind of mod you put (if it's a mod, of course).

logical

The very beginning of the game. I got to the automatic telephone exchange and there, on assignment, you need to open the safe in the attic. I've been looking for the key for almost 2 weeks. Tell me where to find it?

Game: Steel Clear Sky

Mark2022
If I understand what you mean , then you just need to find the safe and bring the cidor.

It is large, not lifting. On the roof.

Take the box to Sidor