We have to collect the headphones in at the end of the flight, once pax have disembarked and record the number. They then have to be security sealed in a bag. This is something we never did previously. If we collected and recorded fewer than 14 then it clearly isn't our fault. However, if we make no attempt to collect any at all and leave them on the seats in the cabin then I can imagine getting a fairly heavily worded email from a manager somewhere.