If you are playing the job in question and there's another player in the party who could out-need you for the items, try asking politely if they will pass for you since it's an upgrade. Many players will be happy to do this.

If they decline, then not much you can do. They have just as much right to need an item as you do, regardless of whether they want it for seals, glamours, or fancy toilet paper.

To challenge this is basically petty entitlement.