It's already been shown in this thread that you can change your name with the use of world transfers, so why is it that a npc would remember a player if they had a different name. Also there are lots of different reasons for not being able to deliver certain items. If I recall you can't send augmented items period. I have some crappy low level ring that I augmented using FoV. It has no plot significance at all, yet I can't send it to a mule. If I had to gander a guess as why that is it's probably because the way the delivery box works doesn't take in a variable for whether or not the item has augments and what they are. And at the end of the day, that's what all out characters are. We are all just a list of object with stored variables. The guild master isn't reading my POL I.D. all that matters is my variable for alchemy skill is at 110. If you need anymore proof that we are just a bunch of numbers to npcs talk to the moogles for the anniversary event and have them list off how many times you have died and stuff.