Cobble Hill 500 Piece Puzzle - Rufous Hummingbird - Sample Poster Included

I love this puzzle. I bought it because the colors match my kitchen, and because my daughter who passed away loved hummingbirds. But when I got it put together, it was missing a piece. I looked everywhere, but not found. So I know I didn't drop it on the floor. Don't know if it could be a manufacture or what.

Great puzzle