I still don't understand how I succeeded in getting my letters off. I took my DS to this particular area where I can access the Mog, and there was one poor soul who was active. He/she didn't reply to my letter, so I went ahead and sent the other required letters. Unfortunately, I didn't realize you have to send 7 letters for each GROUP of characters (so you have to send a total of 21, 7 for each of the three sets of characters!). I only have one set which is able to get the unlockables and they were my least capable (newest) characters. I'll have to try again later this week.

To be honest, the unlockables have been a mixed lot. After sending the 7 letters to another player, you have to start sending 4 letters to each of the game characters, resetting the DS time with each letter- I found it irritating. I did as I was told and still don't have the final dungeon. I don't know what I did wrong. Getting the master Weapons was my major desire. The Onion Knight so far has been a real disappointment. I know they are slow to achieve JL's but PLEASE! The Ultima Weapon was somewhat a disappointment as well (unusable by several of my character jobs).