Was it a grungy lab map? If so, I think it's
maps/Missions/Unique/5thAnniversary/Freedom_Phalanx_Base/Freedom_Phalanx_Base.txt
because there's a 5th Column jail at -4366 -9.5 -279.
And maybe the prison Reichsman was in is -2900 0.5 -230.
Edit: Or -2900 4.9 0 more likely