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This question and that sticker is all over Toyota and Lexus forums. Apparently it's to account for port installed options, they have to account for the added weight. Mine doesn't have one. Guess you can't have a fully loaded car and your Chihuahua too.
Just checked mine - 7 kg or 15 lbs. I have the door edge guards, carpeted floor mats (no all-weather mats here), and the dash camera. Not sure if the carpet mats affect the number or not, but I am quite certain the dash camera does.