I rather like the idea of just dumping all seals and cards in the delivery crate regardless of whether or not you're on a trial that needs the items. Then when you do a trial, you're drawing from your bank of seals/cards. No need for an extra NPC, no need to have to get them back from the NPC, and you can talk to Green I think it is, the underused mog that only does jobemotes, to find out your current balances.