When looking for WebCenter Content patches, you have to filter on the FMW (fusion middleware) version opposed to the WCC version. This is a bit different from IPM or other apps.
At some point, it appears that MOS stopped attaching patches to the WCC prefix and started to attach to the FMW filter.
See the above screenshots for the differences. Notice how many items are returned for the FMW 188.8.131.52/7 vs. the WCC 184.108.40.206/7 search.
Just want to let everyone know the correct place to look may not be the obvious place for WCC patches!