Labeling stuff with ways to contact the steward(s) is just a good idea and takes little effort (though permanent markers do have an annoying tendency to be scarce when most needed). Maybe we should print out a bunch of labels that say "Hi! This thing isn't labeled and I (the person who put this sticker on it) don't know who, is the steward of this item. Please label this item with at least an email address, phone number or other point of contact. If you can add the intended purpose and name of associated omni collective then even better!".