Well done for solving the cat problem!
Re. the leaves. I think hogs sometimes like to keep us guessing! But maybe thinking of making a nest in there. That’s what happened here last year. In the end I had to have a new feed box and over the next couple of nights, the hog created a beautiful nest of woven grasses and leaves, etc. in the original one. Luckily I had retrieved the bowl after the first night. That still had food in it too.