From memory, I think we put ours (an FX80 rather than the MX80) in a box to keep the sound down. It was used with an [HP86](https://archive.org/details/PersonalComputerWorld1982-10/pag...) controlling some lab equipment. Setting that up was my first paid job.
I think they were mandatory for Doctors medical practices after some point in Germany.
There the Epsons were called the "Ärztedrucker" because Doctors they used them for "carbon copy" prescriptions. Even after Laser- or Inkjetprinters were common. No carbon copy possible there. And they had to be carbon copied, for legal reasons.
They sold boxes specifically for that.