Yes, I’m Polish American and was traveling from West Germany to Poland. It wasn’t so bad once we bribed them. It turned-out the guards just wanted Marlboros, Johnny Walker, and US dollars. We still had to reassemble the Mercedes.
Police in Germany regularly pulls regular coach service aside to some warehouse and searches in detail everyone's posessions on them. It tends to happen close to borders but not necessarily. It happened to me close to xmas in 2008, people had to unwrap their christmas gifts... I try to fly instead since. Border police are no joke