Where's the Yongnuo?

Where's the Youngnuo gone? It is the clever wee flash trigger thing I pretty much have permanently on the camera. I recalled quickly the occassion of using it last; for some odd looking toadstools on the walk yesterday. It must have fallen off sometime after that. Its absence was spotted as I prepared to take the boys for a pre-darkness walk tonight. I would now simply retrace my steps on the new walk.
About a hundred yards from the mushroom spot (I don't know what they are) I could see it on the road 50 paces away. It has the proportions of a elongated matchbox. Getting closer, Yes, definitely found it. 

Unfortunately a truck or digger had driven over it.  Oh, Bother!