Apparently the easiest way to identify a cheater is to post something unique on someones wall and tell GREE. I assume they do a search for your exact post on all walls.
I found myself wondering why I was posting something unique instead of something another cheater reporter posts. They would find 2 cheaters with 1 support ticket if I posted the same thing as another cheater reporter.
Why doesn't GREE implement something simple like a popup saying "Post 'abc123abc123' on the wall of any suspected cheaters." If the cheaters try and flood the search system then they will be pointing themselves out. Think "This guy reported 100 cheaters this week. Lets take a look at him." from the support side. GREE can see who posted it and who's wall it went on. If someone repeatedly reports non-cheaters it should be easy to crop their posts out of the results if they aren't cheating, themselves, and easier to find them if they are. Plus it would erase the support ticket build up. They could just scan for abc123abc123 a couple times a week and take a look.