Again, Sanskrit, welcome. I can't help you with any seed of Polygonatum, but if people know where you are then they will know how easy or hard it is to send seed to you, so they're more likely to offer.
I only grow a couple of Polygonatum myself, and some of those are relatively young seedlings that have never flowered. I've never seen seed form on any of the mature Polygonatum that I grow. Sorry I can't help you in your search.
All the best.