For that vintage gun, in a model 19-6 which has been shot and perhaps carried a bit, I wouldn't pay any premium for the box. If there happens to be one with the gun, fine, but I wouldn't pay extra for it. That said, the 2.5 inch 19s are in demand and I certainly wouldn't toss the box/papers. Nice gun by the way.
And that comment doesn't go for all boxes. When I moved from Seattle some 30 odd years ago moving day was a bit frantic. By the time the moving van left we were preparing for a long drive to Texas. My wife said "oops, looks like they forgot to pack this box of gun boxes, do you want them?" I said no, they're just boxes, not going to haul them in the car. One of several mistakes I've made over the years as I'd now very much like to have those Colt Series 70 and earlier and S&W two piece boxes from the '60s/'70s.
Jeff
SWCA #1457