About 3 months ago we had the Ironport Proxy traffic being redirected from our 6509s via WCCP. It is normal to not see the L2 redirected packets incrementing when you issue the "show ip wccp 61 detail" command since it is using hardware redirection.
We have since moved the wccp redirection to our ASA firewalls since I needed to move my redirection for WAAS back to the 6509s. I am still seeing 0 packets being redirected according to the output but I know I am optimizing based on the output from my WAAS servers.
Regards