Don’t worry you will find it eventually, from what i know you will be able to find it around the end of the night 2.
That doesn't help at all.
Sorry but that all i can say until it is released here on itch.io, Also i still didn’t get pass the office area yet so i can’t say more about.
But as i mentioned the screwdriver is around the end of the night 2 the room it in is not easy to explain.