I'm not familiar with your car but I'm pretty sure you probably tested the battery with the hood open and the doors open so the car alarm was off, thus that circuit would not draw current.
You need to connect your ohmmeter probably with the help of some extension wire between the battery and the ground, set to read current (ma) while being able to have the car in it's normal parking position. That means hood down, roof up, doors all closed etc. Then you read the current. Then you activate the alarm (I assume it's a beeper) and read current again. The difference in current would be alarm related. I bet it will be high enough to drain the battery in 4 days.