Live in the middle of a row of terraces - houses on either side and overlooked by another row at the back. For a few weeks now, we and the neighbours on one side have been waking up to food in our back gardens. Usually, slices of bread scattered around - sometimes quite a lot. Once we had a cooked sausage right in front of our patio doors, once an entire bag of food waste, and yesterday, half a supermarket roast beef sandwich. 
I'd assume an animal except none of the food has ever been so much as nibbled on! We have a cat but he's a fussy bugger with no interest in human food. The neighbours on either side of us have lived here for years and are lovely, so highly doubt its them. Suppose it could be someone throwing it over from the house/s behind - but it'd be a hell of a throw, especially in the case of the sausage!
I'm guessing a fox but why would they bring food into our gardens and not eat it? It's been going on since before C-19 started so not related to that. I am so intrigued!