Bed bugs appearing in the office space is becoming more and more common. Often, someone brings a bed bug to the office on their clothes, and the bed bug roams away from the garment. These don't normally turn into reproducing infestation.
The first area of infestation will normally be the desk chair. You would need to inspect the creases and the fabric of the chair. Check the crack, folds, and crevices. Then, inspect the area around the chair.
You can set up a bed board monitoring system around the office to check for them. Bed bugs typically feed at night. So, in order for them to feed, they would have to feed during the day. This is a disruption.