the ist, colt may be worth a bit as a display if welded up,
2nd one is a belguim 12-6 gun worth 150.oo maybe if you can find a buyer , plus what ever the hell some one would pay for the grips that you could not use on a gun and shoot
the last picture is real poor so can't tell is the gun is good or not, but that is the only one that may be worth any amount of money.
Has the paper work been found for them, my guess would be no.
If not, that has to be dealt with.