I've had many conversations with many bank managers and tellers over the years. While many of them will snatch any silver they come across, they do not actively search for it by buying rolls/boxes. Most of them say something like this, "I've been in this place 40+ hours a week, every week for 'X' number of years. The LAST thing I want to do in my off-time is look at more coins."
This makes sense. I play poker for a living. When I'm not working, the last thing I want to see is a deck of cards. Anything but a deck of cards. Of course, when my friends and I have a little get-together, thats exactly what they want to do, and cannot understand why I always try to talk them into doing something...anything else.
So, I would imagine that there are a few coin courier employees that CRH...but I bet it isn't many. What is "fun" to us, is "work" to them.