removal of update rpms from YaST directory

I have been in the habit of *not* checking the box that says "remove source packages after update" when I do a YOU update. Now I would like to delete all those rpms. I see that there are many files under /var/lib/YaST2/you/mnt/i386/update/9.3. Here is the info: /var/lib/YaST2/you/mnt/i386/update/9.3> du -khs * 21M deltas 1.7M patches 243M rpm 8.0K scripts I see rpm files under the patches and rpm directories. Which files from those directories can be deleted without confusing YOU?