prius smart key
I have a 2006 Prius and my wife lost one of the smart keys. The other one works fine, but I wanted to replace the lost one. I purchased one on e-bay from a reputable dealer. Neither myself or a Toyota Dealer could program it. I exchanged it for another one and the same problem occured, this time at a different dealer. When I asked the dealer about it, he said that the only way another smart key can be programmed to the car is if that remote has NEVER been programmed to any other car. Is this true? If so, how come so many people on e-bay are selling them with positive feedback from the buyers?