Normally, CWR are scarce around these parts... I normally ask for any half dollars they have. When they ask, "how much?" I reply, "all of them"... which usually produces 7.50 cents of clad from the teller tray. While they are momentarily stunned by this request, I'll say, "I'll take any half dollars you have, loose, rolls, or in boxes...."
Went to a new bank to score some future boxes, and got 9 CWR's... I was so surprised by them, I left the bank without my $50.00 change... scored my first Ben in the CWR.... and went back a half hour later for my change...