My company doesn't do a lot of incoming inspection, so I have not done what you suggest. Hopefully, counterfeit material is an infrequent occurrence for you. Rather than a checklist, which employees will quickly tire of, I suggest pictures, because images stay in memory longer, pictures make the problem real, and raise people 's vigilance for anomalies you could never predict.
My take on your idea is a placard or a poster series suitable for posting at the inspection station or on the company bulletin board. Rotate the posters every month to keep the problem fresh in people's minds. If you make it a conversation starter, that can only help with awareness and vigilance. Pictures of misspellings, crooked labels, color or texture distortions, etc. Use as many pictures as you can find from your own experience or your industry. Ask your suppliers for photos from their experience, sharing can only increase awareness for all of us on an industry-wide problem. You can find photos of additional examples from GIDEP or a Google search. Search for publications or symposiums on the problem, where you might find other photos your people can relate to. As soon as you have a placard you are pleased with, come back and share it here at the Cove. I thank you in advance for pursuing this idea.