I am now very wary of buying some products from Amazon due to counterfeiting. I seem impossible to buy genuine razor blades as one example.

I bought my wife a Nutribullet from Amazon (marketplace seller) only to find it was counterfeit. It even cost more than my local store. Amazon weren't consistently helpful either. After being really supportive speaking with them, they just didn't follow through. They then asked me to return the item to the seller, but I refused as the seller would only list it again. If it wasn't a safety risk to others, I wouldn't have cared as much. I did get my refund after a lot of effort.

When it comes to power adapters I don't risk cheap third party makes.