At a court hearing on Monday in the city of Kiel, about 100km (60 miles) north of Hamburg, lawyers were trying to determine whether the man's military collection had violated Germany's War Weapons Control Act.
The act regulates the manufacture, sale, and transport of weapons of war.
Since the items were already manufactured, I can't see that definition being met. He wasn't offering them for sale, and the only ones transporting them were the people that seized them from the basement.