During McD's Monopoly season, I just look for Monopoly Stickers in the trash, people often throw prizes away without even peeling for a look. I do this every year, occasionally once in a blue moon, I may find a real prize sticker, but I generally am interested in free treat stickers, like free drink, free fries, and give the excess food item prizes to folks I see on the street. I have yet to see a single McD person say anything to me for digging around in their trash cans in front of their customers. One of their patrons said of my actions "Now that's what I call diligence."
yeah, I do the same thing, but I don't go rooting through stuff if it looks dirty. usually I just keep an eye out for an unpeeled sticker to buy myself a free frenchfry or something. I too give them out to the homeless or needy if I have no use for them at hte moment.