I'm sure counterfeiters by now know what to look for in the computer age. Keeping tight lip maybe 10 years ago would slow down the reproductions but today there is so much that people freely post that makes it a treasure trove for counterfeiters. CRG posts here are one example with the freely posting of trim and VIN tags which eventually become metadata for a web browser to pick up for anyone looking for these images. Also, you can freely download real trim tag examples and look at them for comparison from a few web site already. A Google search is all one needs to do.
Educating the consumer is a double edge blade. In one hand you can teach them and they will be able to spot a fake and avoid falling prey and yet the counterfeiters can also learn.
I have been down this route in the gun collecting industry where fakes show up too but there are people who do teach what to look for. But, no matter how hard a counterfeiters tries, there are always little nuances that will spring up to raise a flag. I'm sure one day the perfect stamp will appear and then the only identifiable 'DNA' will be the machine marks for comparison on similar period tags like with Vette's. Camaro's will be harder of course because they are painted. Using the Corvette crowd as an example, once the publication was available that showed how to identify real (hence fakes too) 'Vette tags, then that reduced the numbers of fakes showing up, that is how I understand it anyway.