This is indeed a problem and it has happened to me even reviewing items on Vine. I have received items that I didn’t order, sometimes entirely different from what I have picked…
It might be counterfeit. They might also be bulk-buying trays and selling them by piece.
My first advice to anyone buying parts: test the bloody things ASAP.
The sooner you get an RMA or credit card chargeback started the sooner you’re okay.