I have some McCoy pottery, but the value is definitely lower than it use to be some years ago. The blue bird bow knot G667 is very rare and it is difficult to find information pertaining to the value. With that being said, I can tell you that the basin & pitcher sold for $209.99 in 7/2017 (Ebay). And the only piece I could find was a chamber pot & lid which sold for $69.99 in 4/2016 (Ebay). I wish I could tell you more, but hope this helps a bit.

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 !!