.......some have seen this but many have not. very helpful information for those that buy slabbed coins. http://coins.about.com/od/coingradi...agnostics/Fake-PCGS-Slab-Diagnostics.-1yO.htm
Here is some fake slabs along with fake coins. http://forums.collectors.com/messageview.cfm?catid=26&threadid=727972&STARTPAGE=1