This is the 11519th most frequent Russian word.
доставленного
"Delivered."
Here, "доставленного" functions as a past passive participle, describing the letter that has been delivered.
Документ был проверен после доставленного письма.
The document was reviewed after the delivered letter.
"Доставленного" in this sentence acts as a predicate participle, describing the state of the person being delivered.
Человек, доставленного в больницу, нуждался в срочной помощи.
The person, delivered to the hospital, needed urgent help.
In this example, "доставленного" is used as an adjective modifier, providing more information about the goods.