the great mask debate

One of the companies that I pick up from periodically went full on, at the start of this. Masks for every employee, all day, hand sanitizer, etc. And every person who enters has to fill in a questionnaire every time they enter the building.
They still had at least one outbreak in the company, as has a few other large employers in town.
The company I work for has currently 10 staff in our building. We are regularly in close proximity with each other, our office is small, none of us wear a mask in the office or the warehouse. So far, one driver has been tested, because he called in sick one day, but he says he feels fine now. He can't return to work until he gets a negative result or self quarantines for 14 days.