I fail to see ANY similarity between the southern gun auction and the knife sheath story. Breaking up a virtually complete rifle in order to have parts for other incomplete rifles is NOT the same as reuniting two sheaths with their original knives. Is this a high dollar golden age rifle, no... but that doesn't mean it shouldn't be treated with the same respect. The southern rifle could have been placed on gunbroker, auctionarms, or even in the for sale section here if it is your listing, and kept intact for future owners. I don't think a longrifle enthusiast would separate a piece of history in order to fund a different restoration project. Regardless of trying to make a buck, it's a lousy thing for an intact historical artifact to go through. My bet is that it could have been sold for more intact elsewhere than the pieces will fetch on Ebay.
All of what happens to these things is up to the current owners I suppose, they can do what they please. Whether they survive for the next generation to study is up to us, we're merely temporary caretakers at best.