https://www.heise.de/news/Bundesverfassungsgericht-lehnt-Bes... (German article)
https://www.heise.de/news/Bundesverfassungsgericht-lehnt-Bes... (German article)
When the changes that toughened the § 202 StGB were made in 2007, there were a lot of public rallies against it in which many programmers participated. These were ignored by the politicians in power. This (together with other worrying political events) even lead to a temporary upcoming of a new party (Piratenpartei) in Germany.
The fact that these rallies were ignored by the politicians in power lead to the situation that from then on by many programmers the German politicians got considered to be about as trustworthy as child molesters who have relapsed several times.
It costs next to nothing to try out a key in multiple places in the same proximity. Once you start going door to door using a random key you found, that's suspicious.
*it occurs to me now that I write this that this behavior is suspicious as well and probably illegal. He should have turned it into the leasing office.