Still Looking for the Key

I'm still pillaging my way through Loathing, looking for the last necessary key. Above is one of my consolation prizes:

The Best Meal of My Life Trophy

which you can earn by eating  60 White Citadel burgers, 10 orders of White Citadel fries, four Cherry Cloaca Colas and four Diet Cloaca Colas. 

I'm still waiting for the heart attack.