Merchant Job Change Guide

Head to Alberta and enter the Merchant Guild in the southwest corner (alberta 36,42). Inside talk to Chief Mahnsoo (Merchant) behind the desk to sign up to become a Merchant.

He will ask you to pay a fee of 1,000 Zeny before beginning the quest. You can pay half (500z) before and half (500z) after the quest if you lack the funds. You will also be given a serial number and destination. Do not forget them! The serial number is randomly chosen between one of these:

2485741
2328137
2989396
2191737
3012685
3487372
3318702
3543625

Merchant Guildsman alberta\_in 28, 29

This is where you should get your product from. You must give him the correct serial number, he will accept any number as mentioned previously. Here is a list of possible designation and serial numbers:

Kafra Worker in the Former Swordman Association in Prontera ( (Serial #: 2485741 or 2328137) )
Man in Mage Guild in Geffen (Serial #: 2989396 or 2191737)
Java Dullihan, the Dyermaker in Morroc (Serial #: 3012685 or 3487372)
Kafra worker in Byalan island, Chief Mahnsoo will also throw in a personal letter. (Serial #: 3318702 or 3543625)

If in any case you drop / lost your del box, talk to him again without a del box in your inventory. He will tell you to talk to Chief Mahnsoo and start the test all over again.

The destination is one of the following:

Izlude Dungeon (Bylan Island) - Kafra Employee (106,58)
Prontera - Southeastern corner, Kafra Employee (248,42)
Geffen - Mage Guild in the northwest building, to the man with glasses (in: 155,122)
Morocc - Dyemaker's house in the northeastern house, he is located in the room directly to the right after you enter the house (271,269)

Head down into the warehouse and speak with the warehouse supervisor (alberta\_in 28,29). You must the enter the serial number as well as the destination of the parcel. The supervisor will give you a parcel even if you enter the wrong serial number and/or destination, but the receiving NPC will not accept it, thus requiring the player to start over.
Deliver the parcel to the appropriate NPC. You will receive a Receipt from them if step 3 was done correctly.
Return to Alberta and present the supervisor with the receipt, then speak with Chief Mahnsoo again to become a Merchant.