There’s a running gag in archaeology that variations on “ritual purposes” actually means “I have no idea what this was for”.
That said, there has historically been a connection between certain divination practices and games of chance, so this could easily be both.
It could just be a difference of the liquor, or color balance in the photo, but I think that first picture might be an Old Fashioned rather than just bourbon. It has that sort of reddish-purple tinge to it that you get from angostura bitters.