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Both you guys need to go to your local lexus dealer and ask about lexus ECM exchange program. Same thing happen to me got my SC400 without a master key. Got a ECM for the cost of a new master key and $145 labor. Hell some dealer will exchange your ECM with the purchace of 2 master keys. Good luck
if i were you i'd go back to the dealer and ask them for a ecu exchange.
because you only have a valet key, you would not be able to program a master key. a new ecu + master keys + labor $1000+ easily. so complain all you can...
goodluck