Wrong item in impossible to gauge Thud Aman Trove

Platform:Windows 11
ISP:Spectrum
Type of Internet Connection:Wifi
Internet Connection Speed: 255.34 mbs
Date & Time:3:30pm est
Frequency: once
Character Name: Rickyz
Race: Hume
World: Lakshmi
Main Job: Red Mage
Support Job: Ninja
Area and Coordinates: Horlais Peak (?-?)
Party or Solo: Alliance
NPC Name: AMAN Trove
Monster Name: AMAN Trove
Steps:
Went into AMAN Trove and obtained an Impossible to Gauge Thud
Opened Chest in the center and recieved Borealis Shadows' Coffer (https://www.bg-wiki.com/ffxi/Borealis's_Coffer)
Spoke with others in community and this is the only coffer anyone has seen.
Possibly incorrect item for the Borealis Pulse weapon (https://www.bg-wiki.com/ffxi/Borealis)
Here is a screenshot of the drop table --> https://imgur.com/a/XS4Bxyb