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Date & Time: 7/16 5:30
Frequency: N/A
World name: Hyperion
Character name: Gahoo Yah
Retainer name: N/A
NPC name: Overworked porter & Tataru
Monster name: N/A
Class/Level: BLM 67
Party or solo: Solo
In-game time: 4:33am
Area and coordinates:
Kugane - Rakuza District - Sanjo Hanamachi (11.0-7.8)
Kugane - Ijin District - The Ruby Bazaar (6.0-6.1)

Steps:
1. Accept quest and properly receive the key item "Lilac-scented Love Letter"
2. Trade the key item "Lilac-scented Love Letter" to the Overworked porter at Kugane - Rakuza District - Sanjo Hanamachi (11.0-7.8) and receive the improper key item "Magitek Field Generator Manual"
NB: you should receive the key item "Cid's Parcel" at this stage.
3. Trade the improper key item "Magitek Field Generator Manual" to Tataru at Kugane - Ijin District - The Ruby Bazaar (6.0-6.1) and receive the improper key item "Cid's Parcel".
NB: you should receive the key item "Magitek Field Generator Manual" at this stage.
4. Trade the improper key item "Cid's Parcel" to Alphinaud at Yanxia - Valley of the Fallen Rainbow - The House of the Fierce (24.9-13.0)
NB: you should be trading the key item "Magitek Field Generator Manual" at this stage.

TLDR; the key items are swapped