As is most things in Despair, if you don't see anything, don't think it's not working. You might not meet requirements, or the randomness affect that is oh so common in Despair in mostly everything I do here, has taken affect.
When you find something, think that it's rare, and that others around you might not have it. Use it to barter, trade for this or that, post on it on the forum or facebook, see if others are interested, or ask how rare it is (how's that for a run on).
Not duds, just a bit hard here, which means when it does happen, when it does rain, IT POURS.