Our son dropped his Volvo in Munich last September.  He said the process took about 20 minutes, very easy.  He was taking the train so couldn't comment on the airport.  I bet the OSD center would give you an email for the Munich office and you could email and ask them about getting to the airport, what time they open and anything other information you need.  The OSD center does give you a Munich map of where to take the car.  Don't know where your car is shipping to but his took about 4 weeks to a dealer in Binghamton, New York.  Good luck.