The curse of a puzzle checker

I knew my run had to come to an end at some point. I knew that a missing piece was bound to appear (or not as the case may be) at some point through all the jigsaws I check. What I wasn't prepared for was two on the trot. However, I have included them here as until that final sad moment of realisation that the missing piece wasn't on the floor they had been rather good puzzles.

Double Sided Impossipuzzle - The airport (1000 pieces)
King Puzzles: Department Store (1000 pieces)

Time taken: an evening a piece