Originally Posted by UtahFox
If you can somehow manage to look to the pannier in this pic below (if you can't, I totally understand), you can see what appears to be a cable locking the bag to the bike. That might be a similar level deterant to the one you found, slightly stealthier though - you probably can't even see it
* pic from the Sibersky Extreme RR.
That's a PacSafe cable lock.