194 Model

I recently purchased an 07 ES350 and have found it to be a fantastic car with no major issues. The one thing that occurred is that my wife's wireless key suffered a dead battery and she used the driver door lock after removing the cover. The cover somehow became lost in the shuffle and I have not been able to locate a new cover. Can anyone offer a suggestion on it? I have contacted two Lexus dealer parts departments without a response from either.