I have fixed as bad and worse.
Pull together "every" piece, no matter how small,.......
Get a magnifier, elmers white glue, and a small moist towelette, Q-tips, tooth pics,....
and some blue masking tape, some rubber bands, and odds and ends to "prop".
(paperback books, magazines, a lighter, small containers)
Just like a puzzle, pick where to start, and carefully try the likely pieces, using no force,
into the likely places.
Always make sure you don't, "land lock" a spot where a piece goes,... but you have to
remove a piece to put it there.
When you find where your first piece goes, moisten slightly the dry exposed surfaces
with water. Then a small amount of white glue, then put it into position.
Shift it slightly while fitting it back in place. Feel for when it finds home and has a solid feel.
Hold it for a fair bit, any excess glue that squeezed out should now be wiped off with a
slightly moist towelette or Q-tip.
(the foam tipped swabs work better, they're fiber free)
If good fortune is with you, you may be able to put a rubber band, tape, or carefully prop
the piece so that you can take a break,.....
If not, you will have to hold the piece in position for a least 5 minutes.
A warm room works better.
Many of the tiniest slivers can be placed after main pieces are in place,
but not always.
If you know someone that is good with puzzles, and isn't a klutz, ask for help.
This method will make the article a "display" piece.
You won't be able to toss it around in a game of think fast.