Well, the Polish troops found them and tested them, and it tested positive for sarin and mustard gas.
Then they were handed over to ????, and the new tests showed the shells were negative.
"Shell game"? (I couldn't resist the pun)
How do we know that there aren't some moles among the coalition forces, who could have washed out the shells, or switched them, so we can't claim success.
Let us speculate on disinformation...
your thoughts?