I make many visits to Nantes and I’ve only ever seen F-BGNJ outside – although having looked at the Aeroscope website, it’s evident that, at some time, she’s been inside for a paint job.
I’m surpised at the suggestion that, during 2007, F-BGNJ was “impounded” by the French military. I’ve never seen any sign of military presence at Nantes – either on the present terminal side or the old hangar side. I wonder if any French forum member can shed any more light on this?