where did they go and why?
Good question. Now I am not a coyote and therefore can't answer, but to guess... with all that feed laying there? Why go anywhere. But then yotes move, they come and they go. Maybe the food was good and they hung around longer than they would have anyway because of it. Maybe it was just time for them to be somewhere else. Maybe they found another dead cow or deer. I don't mess around a bait pile or a set after making it one can not improve on Mother Nature you know... A dead cow is hard to beat, just by itself.
Maybe you are premature in starting to worry about the coyotes being gone,
and they are waiting for the meat to age a bit to their tastes, they will be back if I know coyotes. Good luck, the wondering and questioning is the sign that you are learning and thinking like a yote.