Statistically still quite unlikely I guess, and in any case, he would know better than any of us because he's the one who slept exclusively on trains for 1.5 years ;)
How is it unlikely, i know plenty of people personally that had something stolen in the high speed train in Germany while they weren't looking. And he's sleeping in the train every day.
Well, sounds like the people you know are not the brightest.
Usually they make announcements on the stations where thefts occur to watch your belongings. (Usually where the train stays for 10-20 Minutes).
I also don't know anyone who has gotten something stolen on the train personally.
