Locking Range Bag to Vehicle?

What are you all doing to secure your range bag and/or long gun cases in your vehicle when you have to leave in unattended? Obviously keeping it in the trunk (using a cover if SUV) and vehicle locked, but I am thinking more along the lines of physical cable ties / locks?

I currently have this range bag along with some various hard/soft rifle cases.

My thought was to get some of the small TSA cable locks (like this) to secure the actual zipper compartment and then a cable lock (like this) through the metal rings on the bag tied to hooks in my trunk.

I realize that any determined thief can get around these. I am just trying to be as safe and secure as possible. The area where I will be parking has parking attendants and I would plan to park near them on days when I had my range stuff in the car.

EDIT: will also add that I have no bumper stickers or logos that would identify me as a gun owner on my vehicle.