Hi, Rusty!
A jigsaw case - if indeed that is the correct term for it - is a large board (to accommodate 1,000 piece jigsaw) that has covers - so you can leave the part- completed jigsaw in situ whilst you are doing it.
I am under the impression that you can stand the case on its side rather than having to leave it flat but am not sure about that?
I will tell you how effective it is once I have experienced such!
Both are a present from my daughter.
I'm not getting that clue?
How do you arrive at "world famous"?
I can see it is an anagram of "formal do" (I'd already got that far this morning) and now plus 'w' from 'with'?
But there is still a 'u' and an 's' missing?
How Malone has explained it doesn't provide those letters??
Am I being dim here?