I thought I'd up load an older picture of the sherman track so you can see it as it was a few years ago. Notice it was more buried then than it is today, but this picture also shows to its right the remains of the weasel track, which even then was mostly below the surface. At the time I remember it did seem complete because it was quite long. Of course there's a chance it's still there but perhaps now hidden below the surface. So next time you revisit or any other forum member that see's this, have a little scratch just below the surface to see if it still remains.
All the best.