Not a silver oxblood IMO, Looks like a big difference between these and the eBay auction probably why it only went for $20.oo, it would be the cheapest mint shooter silver ox I've ever seen.
He had a truckload, i believe he has some to spare, pictures of the dig and his haul and everyone else who took part can be seen on AAM. i got some gem mint marbles in the ones i received.
The purple looks like a funky overlapping between the green and yellow IMO, who knows what colors all the overlapping in the OP has, all I know is colors of glass don't mix, they can overlap making it appear as a myriad of different color though.
I just approved your post, it is visible, other's should be chiming in anytime now. Looks like a mixture of cat eyes, clearies, game marbles and a few Vacor