The Stang depicted in Case 182 belonged to Archie Baldochi, a Salvadoran Citizen. The plane became an Air Force asset during the Soccer War in 1969, between El Salvador and Honduras. If I'm not wrong, the plane gained the serial FAS-502.
YS-210P was the Salvadoran civil registered Mustang owned by businessman Archie Baldocchi. According to Dan Hagedorn, this plane (F-51D-25-NA 44-73350, N6176C) was purchased in the U.S. and exported to Salvador in 1965.
It was sold to the U.S. as N33FF in October 1974. During the 100 Hour War (the Soccer War), YS-210P was impressed into service as FAS-402. The light gray paint scheme was covered with hastily applied green camouflage, the plane received national markings and the yellow FAS recognition stripes.
Archie Baldocchi had a Mustang back in the mid 60's as a personal airplane in El Salvador...which he later sold to the Salvadorean air force. As I recall, it was YS-210 something or other...can't remember whether it was P (as in the photo), or not.