Are you the original owner? Has the key worked in the past?I had a trunk emblem that opened up for the trunk key (Boot for you). The chrome kept corroding on the emblem. I had it changed out three times under warranty before I received good one. I know I checked the key on the two doors and trunk when I bought the car new. Eight years later when I tried to open the trunk with the key it did not work in the lock. You never know what could have taken place when you buy a used car. I am sure whoever bought my Riviera could not figure out why the key did not work for the trunk.