I had the same issue back when I bought the RX I could not find anywhere in the vehicle the lock key, so I took it to the Dealer and they took it out and had it replaced with the standard lug nuts on all of the 4 wheels. I figured if its lost once then its possible to be lost again in case I want it to buy another key.

 

Just want to say this is the lady I talk to just right now
10/5/11 an she is amazing, sending picture now. Dealership wanted to charge me $45 for a new set and then $60 for labor to take them off and install the new ones.
*******s!