AI Limit has a total of 3 Merchant Documents to collect for the Expanded Trade Routes trophy & achievement. These documents are turned into the merchant Kyen who is located at the Branch Sunken City Overground – Rooftop Street > Top Apron to add weapon upgrade materials to his shop. None of them are missable and can be obtained at any time as long as you have gained access to the area where they are located. However, once you progress into New Game+ you will have to collect them and turn them in again to make the materials available for purchase.
Obtaining and turning in all Merchant Documents is required for the trophy/achievement 
Expanded Trade Routes – deliver all the documents left behind by Otto, an apprentice from the Moose Caravan, to merchant Kyen.
Merchant Documents
Covenant: Underground Parish
Branch: Sunken City Underground – Underground Parish > Mansion Ground Floor
From the Branch follow the main path until you drop down a square hole with a yellow/black ledge above you, then turn around to see some narrow platforms with an enemy on the left. Follow the path around to the right and up two ladders. Go into the subway car past the chest then jump the small gap into the next car.
Deal with the enemies in the next set of cars then pick this up from the seat on the left. Return it to Kyen to add Luminous Carbon for purchase at his shop.
Covenant: Sewer Town
Branch: Sewer Town – North > Sedimentation Tank
From the Branch, follow the main path down into the lower area, then up the sets of stairs on the other side. When you reach the sewer room, go up the stairs on the left and through the door (not across the path to the right with the second red arrow). In the next room on the right you can find this item. Return it to Kyen to add Luminous Diamond for purchase at his shop.
Merchant’s Map
Branch: Sunken City Underground – Underground Parish > Living Pond
From the right side of the center pillar go up the small ramp to the right, on this platform you can pick up the map. Return it to Kyen to add Luminous Silica for purchase at his shop.
For all other collectible types check out the AI Limit Collectible Guide.
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