I'd like to suggest that items that are dropped at the front of someone else's house may only be picked up by that home owner (unless the house is empty and for sale). A lot of neighborhoods have friendly Glitches who will leave treats, meals, drinks, etc out for each of their neighbors as gifts but I have seen instances where these have been 'collected' by other greedy glitches :(
I had gone through a lot of trouble myself to make enough Hi-Sucrose Corn Syrup Squares for every single neighbor on the Savi Sense quarter, only to have most of them snatched up by a random glitch coming thru to harvest trees on the streets.