Humans Are Scary
In a distant location, an alien stealth vessel had just encountered tragedy!
The modestly-sized observation vessel that had been assigned to keep watch on one of the more vulnerable and less well-defended human settlements.
The secret puelmer spy vessel quietly hovered in the Davute System for many months without issue. The puelmer race had already grown familiar with the division of human organizations and knew that it only really had to watch out for the 'Big Two' and the 'first-rate superstates'.
As for other human forces? They all belonged to the underclass of human society! It was not without reason why they were called space peasants. They didn't even receive the right to operate their own warships!
Since these space peasants posed so little threat to puelmer starships, it should be trivially easy to keep an eye on what went on in their key star systems!