Okay... my take on this.
First... the acronym 'CO' - I assume refers to 'Circuit Overseer' - and not Congregation overseer.
Now. How the heck does someone send 'mail' to a CO - who travels about all the time? Do they publish their address? (When I was a JW - I was not aware of this, if they did.) Of course... when I was a JW, they always travelled and lived in a small mobile home that got pulled behind their Olds 98 sedans, and parked in the KH parking lots during their visits.
I think he was just trying to garner a bit of 'sympathy' from one of the lowly ones.
Or start another 'JW urban legend'. (CO gets hate mail. Film at eleven.)
Regards,
Jim TX