They find worthless items, like the dog lead below, then post them on the local town Facebook page, with other posters saying stuff like "well done for returning it", "it restores my face in human nature", etc etc. Yet when I've dropped/lost expensive items like my £75 gloves and my £45 silk pocket square, surprise! surprise! they don't post pics asking if anyone has lost them! Oh no, they only return crap, hoping for "isn't he/she wonderful"! posts, yet they'll pocket expensive stuff which the owner will never see again!!!
I might 'find' a dumped pizza box with a half eaten pizza in it
and post a photo of it on there, asking if anyone has lost it around such and such an area, then wait for the "you restore my faith....", "and they say people aren't honest these days" type replies.