We've done a couple of threads on this several years ago, it appears that from several of the recovered rounds the Soviets took a different approach, keeping things simple. 152mm, 130mm, 122mm have all been found that were simply dump-filled with flechettes, then flooded with hot wax to make a somewhat more stable cargo. When you open the round you could slide the entire mass out. I still have some flechettes with tiny chunks of wax attached.
In the display pieces they are shown very differently however, I photographed a number of items in the storage area of the Artillery Museum at St. Petersburg. They are all very nice and neat with dividers, etc. I suspect that the practical item went to the field, the pretty items went to the museum.
A little bit of searching should pull up the pictures from each.