That kind of wholesale destruction of irreplaceable historical information goes on all the time, unfortunately. I worked at McDonnell Douglas, subsequently Boeing, in St Louis and they moved the company library from one building to another several times. Each time they discarded massive numbers of reports and photographs. Some friends were able to salvage several large 3-ring binders full of 1940s-50s photos from one of the dumpsters, but that was just the tip of a huge iceberg. It's a tragedy for historians.