Sounds like something saw a tasty meal and was dragging it to the dinner table and got distracted, or the little fellow decided to play possum permanently in front of your hives, either way I wouldn't worry about it too much, especially if the lower entrance sealed.
What I look for is scratch marks in the wood if something was trying to climb on or getting at the landing board, ruffled soil around the hives, you can look at the edges where vermin would be getting close to and see if you find hair stuck in the wood fibres etc.