Hi
@Bob008 ,
That one was about 10 years ago. I posted one near miss from last year a little above. I also found one on a thread in Barcelona, not related to a bus.
I find that while there are people who prey on pilgrims that they usually don't mess with your backpack unless they think you have something valuable (cameras, go pros, drones, electronics, etc). That is why I also dont recommend a lock on your bag. If it is locked it may signify you have something besides dirty socks in there.
Keep anything of value on your person in the bus in a bag on your person. That is also true inside of albergues. Keep everything of value with you even in the shower or if you are traveling with a trusted friend (not someone you met on the Camino) ask your companion to watch your valuables.
It is very upsetting to be a victim of crime. Always report it (even if it is hard to solve). I try to never take anything I can't afford to lose although, I seem to always lose something anyway. (Chargers, towel, a sock, etc.) Some items are easily replaced in the next town and others not.