As a regular vsitor to Bordeaux (altho not in last 4 months) I can confirm there is/was a Mercure there as well as a Caravelle and a Zero G experience A300.
Not sure these are on the military side although they are on opposite side of the field from the main terminal. I think that area where they are is the Avions Marcel Dassault ramp along with assorted airbusses being painted, mended, fitted out etc etc
One thing about the Mercure that strikes me is that it seems to have very marked dihedral on the tailplane-was this to clear engine exhaust as not that much known about underwing engines in Europe when the Mercure designed?
PB