Attorney here. I would argue that your use is "fair use" under the copyright law, since you are using the images to offer comment about the legitimacy of the chips.

The bigger worry isn't copyright it's slander: make sure you're right!

A copyright lawyer would hesitate to take a case that didn't involve a lot of money. And counterfeiters generally can't afford the attention a lawsuit would bring.

Call hsi bluff: Ask him to have his lawyer send you a letter and then you can pass it along to "your attorney."