Key (quest item)

Timon's key
The Key is found together with Orders on stained paper on a wooden stool.

Associated quest

 * Waiting for Goe and Doh

Count Baillairgé's key
The Key is found on the body of a captain, under water together with the Ship captain's log.

Associated quest

 * What Was This About Again?

Alistair's key
The Key is found on the body of Alistair Carnarvon, north-northwest of Castel Ravello Vineyard together with Alistair Carnarvon's journal.

Associated quest

 * The Curse of Carnarvon

Key found on a corpse in a Novigrad alley
This key unlocks a chest in a house by the bridge just north of the Rosemary and Thyme containing 50, Guardsman's boots and 200 florens

Associated quest

 * A Feast for Crows

There are three also keys associated with the quest "Novigrad, Closed City":

Fritz's key
This key does not open the locked cupboard in Fritz's house, it opens one of the other 2 treasure locations. To find the room, Geralt must light the torch at the top of the stairs.

Lussi's key
Schlüssel (Questgegenstand) Clef Chiave Klucz