@ Shaun,how can you take it for granted that we are being disruptive at a site, we repacked every single stone! I live and farm not more then 5km away from these two sites and have been in the nature conservation industry for over twenty years.
@Gitchee-Gummee thanks point taken, if you know the area it is flat grass land with very few stones so to find something that looks like stone henge is not very difficult. A wild fire has passed through the area and the cache was left in a 1lt plastic yoghurt container, I assumed it was burnt. I will now know in future to just log a no find.
O and a last point, I did not replace the cache, I have mailed the owner asking if he would like me to do so as I saw he lives more then a 3 hour drive from the site and says in his bio he only get to our area once a year.