I am sure this may happen very seldom if at all but I bought the Iowa StateCyclone panoramic stadium got it all done and believe it I was short one piece to my puzzle . I was the only one that worked on it and we never moved it so I would swear it was missing. We purchased the puzzle through Scheels sporting goods and I believe still have the receipt but not sure. My question to you does this ever happen? We love the puzzle and I was going to frame it but not with a piece gone. Thank you for my help.