If the boxes are in very good or better condition, they may be of interest to a collector -- especially one who specializes in S&W. They come up for auction occasionally, and usually do not bring a lot of money. However, they are older, and as they say - "they aren't making any more of them." You might consider offering them to a collector in trade for some newer ones.
The 20 ga. is one of the lowest production gauges of the series of S&W shot shells, so should bring $15 to $20 a box from a collector, if they are in nice to minty boxes. Ed.
Thank you for your responses. I seem to be stuck with them. They are slightly too valuable to shoot, but with shipping added to the price they would be hard to sell.
Oh well, when one of my grandsons is my age he can sell them.