[ He is just doing his rounds after all and he knows exactly who he might just run into. But as long as he's doing his job and not hurting anyone, and keeping his nerves together, he'll be fine.
For a moment, he thinks there should be, can be something he can say to Setsuna -- Good day? Here is an invitation for...? I'm sorry? But for some reason his mouth stays shut in an otherwise neutral expression.
Just putting that mail in the mailbox. If Setsuna doesn't have anything to say, then Ribbons will be off to his next destination. ]