Lol, well, I agree to an extent. In the case at both my jobs tho, they are part of our HIPPA safe guards.
Pretty much all the papers we deal with have people's personal health or financial info. Just I go through around 500 pages per day. On top of that, there are hundreds of employees, and it is a massive building. So the employees doing it would be time consuming .
Instead, at every nursing station or in each office room, there is a gray box, with a narrow slit we just put the papers in. And the third party picks it up.
Moreover, it reduces our liability, because we can blame a 3rd party, if some personal health Info was stolen