Map of DLC 4

Well, since Jed don't update his guide about Dissonance Of The Nexus Expansion. I'll do it.

White Frontier

├ White Frontier Field

Treasure Box	Accessory
#2	Bird Mask
#7	Emblem Earrings C
#8	Emblem Earrings A
#13	Emblem Earrings B
#14	Emblem Earrings D
#15	Emblem Earrings E

├ Meteorological Institute Ruins

Treasure Box	Accessory	Weapon
#1	Intellectual's Beret
#2	Emblem Earrings F
#3		Miasma Edge++

├ Meteorological Institute Midpoint Area

Treasure Box	Accessory	Weapon
#1	Seven's Earrings
#2	Emblem Earrings H
#3	Emblem Earrings G
#4		Force 2+

├ Icicle Prison

Treasure Box	Accessory	Outfit
#1	Emblem Earrings I
#3	Siren's Ring
#6		Magician's Robe M
#7		Magician's Robe F
#8	Emblem Earrings J
#9	Diva's Earrings

├ Icicle Prison Depths

Treasure Box	Accessory
#1	Emblem Earrings K

└ Blizzard Region

DLC 4 Main Story only!

Treasure Box	Accessory
#1	Arctic Combat Hat M
#4	Arctic Combat Hat M

Observation Record Boxes' Location

Used to unlock door for some dungeon in White Frontier.

├ Observation Record 1

Near Meteorological Institute Ruins.

├ Observation Record 2

Meteorological Institute Ruins.

└ Observation Record 3

Frozen Plant.

[Laz_IDK]

Four years later, guide still helpful! Thanks

[巨牛的大子]

Thak you for guide! :)

[olichimaru]

Thak you for guide! :)

[Yuma]

Thank you for your work here!
This'll surely come in handy.