Can’t find missing puzzle pieces – Jigsaw Puzzle - Brain Games Review

I am unable to reach developer’s site, or find any FAQ’s. I have completed 2 puzzles from the “Famous Paintings “ collection with the exception of one puzzle piece each. I have moved the puzzle over the entire background page to see if the piece is hidden under the completed portion of the puzzle to no avail. If I could figure out what the problem is this app would receive 5 stars from me. I love the puzzles available and the graphics. Has anyone else had this problem with any of the puzzles in this app? Another puzzle from the “Underwater”collection had all the pieces available and I was able to complete it, although it does not show that I ever worked the puzzle now. Can anyone help me?
Review by Nana2HC on Jigsaw Puzzle - Brain Games.