This is the 5107th most frequent Spanish word.
firmados
"Firmados" means "signed."
Here, 'firmados' is used in its past participle form, agreeing in gender and number with 'documentos', and indicating that the action of signing has been completed.
Los documentos fueron firmados por ambas partes.
The documents were signed by both parties.
Here, 'firmados' is used to describe 'papeles' as having been signed by the director, providing additional information about the papers.
Me entregaron los papeles firmados por el director.
The papers signed by the director were handed to me.
In this sentence, 'firmados' refers to contracts that have been signed, functioning as an adjective modifying 'contratos'.