Tom,
most of those guns are full and fuller, which would be verboten for slugs but you should be fine with those RST's.Real nice find ans don't worry about paying to much,as long as those barrels are sound pre war 16's will always have a market when you want ot get out of it.
Nice find Tom, looking forward to pics this fall of some ditch parrots and that Krieghoff.
One small addional note on Kreighoff,they where also recipients of "appropriated" goods when the Third Reich was in power,Simpson's gun making equipt was given to them for one.Sometimes you win sometimes you lose,sometimes both.
Dave