this has been going on for a while look on alibaba you can get any coin from china i saw a seller say send him a pic and wait 7days he can make anything. They even have fake slabs with real cert numbers on them and some of the sellers will sell you a fake receipt from places like apmex to try and prove it was bought there

even made to look circulated http://www.alibaba.com/product-detail/1964-D-US-WASHINGTON-QUARTER-DOLLARS_60223331887.html

http://www.alibaba.com/product-detail/1873-CC-US-SEATED-LIBERTY-QUARTER_60222710155.html