As I do most of my dumping and picking up on my lunch break each day, and I only have an hour to do it in, I have to plan my route precisely so as not to waste any time. So, therefore, I call ahead the banks I plan on picking up at. Especially if it's CWR or loose.
But sometimes that backfires. Take today, for instance: I called a Wells Fargo branch to see if they had any halves. Customer service guy said, "Yeah, we have a bunch of loose halves. Old ones." I go there, and the teller's look at me like I'm nuts. They said they haven't had any halves, rolls or otherwise, come in for a little while. So, either the guy didn't know what he was talking about or he wanted them for himself and told the tellers to play dumb.