When we opened up in spring we found droppings everywhere, then found the little B.......s had made a nest out of shop towels in the storage locker underneath. They had collected all the rat poison cubes from where I had left them and brought them all to one place in my BBQ cardboard box, they had been eating them all.
I then found one of the culprits in the BBQ box and put him in a field 100yds away. I cleaned everything up, put new poison cubes in various places.
Next visit, (the rig was in storage), same story, new nest, all the poison cubes relocated neatly into to my BBQ box and they even chewed into the plastic poison bag to get at the poison, this time I just left things as they were as they were not going inside the rig but staying in the storage locker.
When we went to collect and use the rig they were gone, probably because they had eaten all the bait. Why they did not die is a mystery