[halper]

I recently crossed a few borders too, and did not show a passport at any time. When I flew out of Germany the police did not even ask for a boarding pass despite me flying with a checked-in pistol (which is why the police got involved at all: the agent said their instructions is to call the police so they can look at it before the baggage is sent on its way). On arrival to Sweden, the "goods to declare" lane was empty and there was a little sign with a phone number and a message amounting to "call the customs people if you have something to declare".