Vegetables on my porch

Damndest thing ever. Keep coming home to vegetables on my porch. I do not have clue one from where. Not that I don't like vegetables, I do. Just wondering who and why?
By the time I get home, in this weather, they are almost baked vegetables; dehydrated vegetables is more like it.
I can imagine someone sitting by their window enjoying my befuddled arrival home as I pull in the garage, walk out and down my walk to my porch, look up-right-left, scoop up the vegetables and walk back through the garage.
Hope I don't see myself on YouTube :)