I did this a few times a couple years ago. I'd get $100 worth at a time (halves). I would get a few 40% halves just about every time, also got an occasional 90% silver half. Even the machine-wrapped rolls had some silver. Your best bet is to get the customer wrapped rolls, unless they have been wrapped by another CRHer. Apparently the average person doesn't realize the 1965-1969 halves are 40% silver.