Like I said in another post, when new the car came with 2 master keys, 1 valet key, and 1 flat key, which is the grand-master key. The flat key has the key's serial# stamped on it. With that number, you can get any number of keys made at your Lexus dealer for $100, I think. The flat key should be inside the pouch that contains the vehicle manuals. It looks just like the other keys, but just does not have the black plastic "L" on it...it is just a naked key. Anyways, you cannot buy the keys on e-bay (I'm sure), as they are laser cut with the grooves on the inside of the key...not a key that one can copy at the local hardware store. The heads of the master keys have a trapezoid shape, and the valet keys have a smaller, more rounded head. I think it's best you get at least 1 master key made, because locking/unlocking the car with the master key also arms/disarms the alarm the same as using the remote. I hope this helps! I want you to start to enjoy the car ASAP!!! B)