I have had two of these boxes and both contained swirls. Seen a few others with swirls and one with Master marbles. I agree that some of these boxes were backfilled. It is nice to see the board game by Kayson's Novelty Co. I have not see it before.
They are listed on Ebay regular. Most collectors end up with one in the first five years of collecting. I still see them available in antique stores. I saw two at the recent Canton OH show, one for $25.00 and one for $20.00 .
Not MK Painted Turtle. I don't know for sure if MK even made any shooter size painted turtle. Plus most of the painted turtles are dark and three or four colors.
I agree the colors are a little off. The bottom left is probably a Alley Blue lady. The bottom right is either CAC of Alley.
Top left could is probably Champion or Alley. But it looks al little pink and slight blue. The top right is Alley.