Oh no, that's a shame.
We didn't have any signs of rats no droppings, no smell, no sightings...until we lost a pet baby rabbit in one of our barns, another had a bite wound on the back of its neck - she survived thankfully.
We were thinking rat, stoat etc what ever got in our barn could squeeze through very small spaces yet kill and drag quite a large rabbit (the body of the wee bunny got stuck under a door after being dragged through 2 rooms)