The letters appear to be a series of documents and records detailing the recent inventory of the Forge, focusing particularly on a number of unusual orders and discrepancies in the inventory. The records go back at least six months.

Inter-spaced between them are a number of short notes:

Excavation equipment -> glass cases? Foreign soil samples?

Large number of spheres + Ooze extract <--- significant

Reassignment Promotion

Insufficient clearance?!!??!

What if: Project Ironwood wasn't shut down? Can't be, no sign of druidic research being conducted.

Materials transported to central lift -> disappear

Forgemaster confirmed 'special' project. Asked to maintain records. High enough to see but not good enough to know...
Look into: raising clearance. Blackmail. Bribery ...