I imagine that millions of these records were carefully stored and moved from house-to-house over the course of a lifetime. With so many from The Greatest Generation leaving us now, these records are finally being cast away, as this set was, to the trash. It's a little sad, but inevitable.
Through that process, and with the sweep of time, they'll become increasingly hard to find collectibles. I'll hold on to this set of records. Maybe you'll do the same with your grandfather's documents. Among the few of us who care, there will be survivors for later.