About 6 years ago I ordered a $150 graphing calculator from Amazon, 'Shipped and sold by Amazon' or whatever the actual phrase was, and iirc there were no 3rd-party sellers for the item. The calculator came in two versions with software differences as well as a different accent color on the hardware to differentiate. I ordered the one with the extra software but instead got the one with the cheaper color and firmware. I returned it for a replacement from Amazon and got the right one that time.

It wasn't counterfeit (I don't think anyone is ripping off high-end TI calculators, and it also came with a license key for the computer software), but I believe it was intentionally incorrectly sold. It came in a blister pack and the paper insert inside plastic indicated it was the CAS model, but the calculator itself was the non-CAS model - in other words, aside from having the non-CAS calculator in the box, it was exactly identical to the CAS model as you would buy from a store.

Maybe TI mixed up their stuff but I doubt that; by that time I had already heard of Amazon selling counterfeit items and as you said there have apparently been lawsuits for this.

About a year later I had the exact same issue occur with another item - sold by Amazon, but fake, but got the right one after a return. Can't remember what it was though.