More details about the old box factory via the WS pages for the other missing persons - Links upthread..
Bild < "....A farm for which Christian B., by his own admission, had a lot of plans. He told neighbours that he had become rich in Portugal through the timber trade. He wanted to convert the old factory into an art farm: "He said he wanted to create sculptures from scrap metal," said a neighbor.
B. had acquired the remote property for little money at a forced sale in Leipzig. Around the time Inga disappeared, the man had been seen almost daily in the yard. There he lived in an old caravan without electricity and running water."