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Haha, sounds really sketchy.... Yes sir, dealer is the only option granted that you have title or registration under your name. They will need that to cut a new key. Without it your stuck.
Out of good faith, the dealer will provide free of charge a new ecu and labor only one time , you only pay for the new keys. I know because it has happened before to other cl members, and you can mention this to the dealer, also the car has to be under your name.
Update>>> I had a valet key made at lexus. Had to take the title ( since i just bought it ) and drivers license. The valet key didn't work. A tech there pointed me to a locksmith on ebay that will program your ecu with 2 keys for 265. just sent out, will keep you guys updated.