DNONAC, nice catch. You did good, reallllllll good !! That gun in the condition the pics show is north of $3000.00. If it had the original magnas maybe more. The box normally found on those is the maroon box for the 50 target in 45 acp with a big black C in grease pencil on the end label. On the bottom of the box where the serial number is found you will often find 45 colt in black grease pencil.

I have one, ser. # S99681 so the 200 were spread around. You just never know what you'll find. The gun shows are a lot like looking for gold. You can find some of the light stuff on the surface, but to find the big stuff, you hafta dig. You hit the mother load.
Enjoy

Bob