http://mccoypotterycollectorssociety.org/wp-content/uploads/2014/03/brush-mccoy-lines.pdf

One of the lids belongs with the Combinet or slop jar (pail) !! They made very few items in this line !! Scroll down on above link to the Bluebird vase !! I have not found anywhere that they made cups with this line !! One of the birds is not the same as the others !! All should be basically the same !!
Where did you get this set ?? Would help to see the bottoms of the larger items !!