Mystery solved...

 Not the poster mystery, I'm still waiting for input on that but we have solved another much smaller mystery. 

First you should know that we have finished another jigsaw puzzle. Here it is.

Fifteen hundred (1500) pieces, and as you can see, lots of picky little details.  It was a challenge, I can assure you.  But you know, it keeps us off the streets and out of trouble.  Our grandchildren don't have to worry about what we're up to.  

However we did face one mystery as we completed this puzzle.  There was one piece missing, a bright red and blue piece that should have been easy to spot.  Now we know that puzzle pieces have a tricky habit of falling off the table and on to the floor after we turn off the lights and go to bed, so we have learned to search the floor around our work space frequently to gather up the fallen pieces.  We have never lost one yet, until yesterday.  The puzzle was completely finished, the floor had been thoroughly searched, still one piece missing.  While we were searching my wonder spouse put his hand in the pocket of the old sweater he wears sometimes while we're in the basement, because it can feel chilly down there, and there, in his pocket was the missing piece.  He assures me that he did not put it there and I believe him.  

Now we have learned that we must search pockets as well as the floor for the most tricky puzzle pieces.  

Fear not, this will not stop us from starting another puzzle.  But maybe just a thousand pieces next time?