The ABC is aware of two other companies that had associations with Ms Lin and were reported by sources to have been involved in providing services to refugees.
One company appears to have been involved in providing security services, according to sources.
A Home Affairs spokesperson on Monday said Home Affairs hadn't had any role in service delivery in PNG since 2021.
Home Affairs was not aware of, or involved in, PNG's contracting arrangements associated with its independent management of the remaining cohort, the spokesperson said.
The spokesperson said Australia had exited regional processing arrangements in PNG in December 2021 and agreed to a funding arrangement with PNG for its exclusive independent management of individuals remaining in the country after December 31, 2021.
"That arrangement provided funding to enable PNG Immigration and Citizenship Services Authority to manage individuals remaining in PNG to self-sufficiency, including settling individuals who chose to make PNG their new home or those seeking third country migration,'' the spokesperson said.