There is some discussion on Bill Boreland counterfits up the thread.
Here are some for any new chippers that have not seen them before. The scans are a little large, sorry. There are others that I would have to load one at a time.
I suggest you ask questions before you buy any NV or DieCard mold chip.
TCR does list most counterfits.
There are plenty of real chips on the 2 molds.