Jigsaw puzzling mystery continues; new technique applies

To explain the appearance of mischievous extra puzzle pieces over the past several seasons, we posited Jarvis, a disgruntled employee who messes with the puzzles. This time, he took nothing away, but added a plain gray piece that obviously couldn't be part of this puzzle.

Below is a dismantling innovation from a neighbour who also enjoys mind-soothing "puzzle therapy." Take the ends off first and store them in a separate bag in the box to make it easier for the next person.