Answering one question

The one about the mouse corpses.

I believe that this is the culprit.

https://video.wixstatic.com/video/03c273_a58a55201e1445cbab27992576b3b8c4/1080p/mp4/file.mp4

Hypocrite that I am, I had left out hog food to capture the creature... but someone else got there first.

https://video.wixstatic.com/video/03c273_b7d5f35607934409ac94df163d7e5d93/1080p/mp4/file.mp4

https://video.wixstatic.com/video/03c273_a16de98446454233925a093a9da0e712/1080p/mp4/file.mp4

Still, the hog did visit.

https://video.wixstatic.com/video/03c273_e108d61875cb4d73b06c202cd2e60d37/1080p/mp4/file.mp4

https://video.wixstatic.com/video/03c273_b88e14aedb114bee9229a100dd9d5a9a/1080p/mp4/file.mp4

And there was nothing at all left for this little chap.

https://video.wixstatic.com/video/03c273_a54c88b69ce34ca2ab48bd2336fa448d/1080p/mp4/file.mp4