I would also suggest you buy your semi's from mouser, Newark, digikey, etc, or some legitimate product line seller.
I just got burned by a Ebay seller who claimed to be selling Toshiba 2SC1678 HF transistors. They turned out to be counterfeit junk where the gain dropped off after 7 MHZ.
The Real ones go all the the way to 30 MHZ.
After contacting him, he immediately "cancelled" the order and refunded my money ( I don't know how that works since I had the transistors!).
I suspect it is way to avoid negative feedback when he gets caught? I say this because I proved to him they were fakes in a couple of ways, yet he is still selling the same junk even though he feigned surprise.
The transistors didn't look right, but i tried them anyway. So it was a slight waste of my time in the end.