What is the context of the documents that Irving finds in the box?

Question

In season 1 episode 9 of Severance, Irving's innie finds a box/trunk in his outie's closet

with what seems to be his dad's uniform (along with a picture of his dad). He then finds a compartment underneath that has multiple documents. One is a newspaper clipping of a man suing Lumon to get more information of a workplace injury; this is Irving's dad, correct?

Another document is

a list of employees with notes on them. Was this a document acquired by his dad for the lawsuit? Or was Irving doing his own investigation into Lumon to find out what happened to his dad? Were the documents in the box there because he was hiding them from somebody? Or because he had become disillusioned with his own investigation?

A third document is

a map that has a few names written on it (including Burt's), indicating where each of these people live. Why?

In short: what is the context of these documents? (I'm guessing some/most of this context will be revealed, in future seasons.)

Answer 1

Irving's outie was investigating Lumon and Lumon's severed employees.

Irving's outie's trunk contains US Navy uniforms, a picture of Irving's father in US Navy uniform, a newspaper clipping about a severed employee suing Lumon because of an injury the employee got while working there, a list of Lumon's severed employees including their personal information and other details, an architectural plan, various documents — some with a Lumon letterhead, and a logistics invoice.

The documents imply that Irving's outie has been collating information about Lumon and Lumon's severed employees. He is recording the employees' ages, addresses, severance dates, college degrees, marital statuses, possible connections to each other, and other details.

The US Navy uniforms and picture of Irving's father in uniform imply Irving's military connection, possibly hinting at why Irving is working at and investigating Lumon.

One is a newspaper clipping of a man suing Lumon to get more information of a workplace injury; this is Irving's dad, correct?

That man is a severed Lumon employee named Dalton Emery. Emery is suing Lumon because of a hand injury that his severed self got while working there. There is no indication that he was Irving's dad. The newspaper clipping is just one of the pieces of information that Irving's outie was collating.

A third document is a map that has a few names written on it (including Burt's), indicating where each of these people live. Why?

As part of his investigation, Irving's outie is recording the addresses of the severed employees and is trying to make contact with some of them. One of the names in the list has a "tried to make contact" note beside it.