Was he actually staying in that old factory…or in his mobile-home nearby ?
Above link from Mail , 15/2/21 , that refers , does not work for some reason ( can find on Google via search “ Christian Brueckner box factory “ ) .
Below is a similar article..
Prosecutors have re-opened the investigation into whether Christian Brueckner abducted Inga Gehricke after she vanished in Saxony-Anhalt during a family outing in 2015.
www.dailymail.co.uk
First article seems to indicate he was staying with a girlfriend in his mobile-home nearby .
If you’re staying in a mobile-home do you have a fixed region ?
If not , then Braunschweig was his last fixed abode so might still be appropriate court ?