I had one of those on my '85. I had a removable "key," though.
EDIT: I was just explaining to my dad why (he just came over), and I though I should elaborate here:
Something inside the lock cylinder popped, so the key wouldn't open the trunk anymore. My mechanic said that this wasn't unusual with GM's. I had the lock drilled, and was in the process of getting a new cylinder set to my key when all mayhem broke loose with the '85. That's why (the mayhem, not the lock) I have a Formula now.
[This message has been edited by Patrick's Dad (edited 05-02-2002).]