I had never met Les but communicated with him about marble bags a few times over the years. He had a wealth of knowledge and was willing to help me learn. This is a sad day for the marble hobby! My condolences to the family!
That is a nice find! Those cello bags are pretty fragile and disintegrate pretty easily so that is probably why we don't see many floating around. The double ender headers are nice - a necessity since the ends of the bags would break more easily than the center. I have one like that. There is also a Vitro Victory Agates double ender bag that I have. Here's a pic