I only recieved two fobs/master keys, also. However, In 2000 when we picked up our RX 300 we got 2 master keys, 1 valet/ service key, and a credit card key.
The creditcard key should theoreticly no longer be needed since the car should never lock with your keys inside. All the credit card key did was unlock the door did not work for ignition.
The Valet key didn't have any of the buttons on it like the master keys and didn't open the glove box I dont think. Not having this key pesents an interesting issue... give you master key to the valet

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--Pete