Sorry I missed this question.
In the office, no. This room is intended to be a time loop, causing MC to feel disoriented and lost. From what you’re saying, seems like it worked. 
The goal for the multiple rooms is to give the reader the freedom to explore at will. Go wherever you want and search whichever room you want without knowing what is waiting for you behind each door.
Adding items in all the rooms would result in some achievements being unattainable in one playthrough. But rest assure that each room offers a different experience to the reader.
One of my personal favorite is the choir room with that creepy writing on the whiteboard that changes every time MC looks at it. The only thing you’ll find in that room is candy and death.
I would say if you are an achievement hunter. Do a first play through to get a feel of where everything is located. Then a second to collect everything that you need.
If you still have doubts, here a guide here