I asked Ken Scott the same question and he didn't recall useable documentation. There is a photo of large pouch with game rings in a book with Arms from the Hermitage Museum. It is photographed with an early flint gun but that is no guarantee that there is any connection. I have made inquiry of Jurgen Malerik but have got no info yet. Bill Young had collected a number Jaeger related items but he passed away a couple years ago.
If anyone has photos of original documented Pouches of this nature, I'm sure we would all like to see them.