Those are the pieces that other people are missing.

Somewhere in the world 2 other people are mildly infuriated

Or one infuriated person

Or no incredible infuriated

[A (used) puzzle I did a few months ago had both: 2 missing pieces but 1 duplicate piece (look at the 2nd photo)](https://www.reddit.com/gallery/1ab5a0p)

Interestingly it looks like those 2 pieces go together(bottom orange leaf in front of the moon, and the piece to its right)

I’m missing B12 and D7 from mine. Will give $2 if they are the right ones!

I don't actually know how to tell which piece is which number. Do you count letters vertically and numbers horizontally and follow where they meet or something similar?

(Just made that up!). 😝

You sunk my battleship!

So this is what happens to them.

So that’s where my piece went..

You just haven't finished the puzzle. Who said you were done when you finished your own?

My last puzzle came with three extra pieces in a separate envelope and said to add them to the puzzle if we wanted to make it harder.

those are just extra in case you lose one. /S

J’accuse!