As with every other part so far, you will have to chase after Celia at the beginning of Part 6. At the end, pick up the origami dove she leaves behind, then upload it to your online profile at the marker shown on your map. When you view the origami, you’ll see a maze.
This maze will end up giving you two different FAN #s, one for the path that leads you out of the maze, and one that consists of the numbers at the dead ends. The former number is 98279935328 and the latter gives you 74631428457 . Input both numbers in the Intranet to see two reports, one with a cypher and another talking about some graffiti.
As soon as you view both reports from the numbers above, you can start the second mission. You will see five markers on your map and your goal is to go to each location, find the spot where you can use your camera and take a picture of the cypher in the environment. They’re hard to find on their own, but you can just move the camera around until the bar on the bottom fills up, which means you will be able to snap the picture.
If you look at the one report from before, you will see that the origami dove is split into sections. For each of the pictures you have taken, one section will be greyed out, which is where we will be getting our numbers. If a section has multiple numbers, then you have to follow the arrows shown on the example.
Basically, you want to start with the image at the top and work your way to the bottom, writing down the numbers in the order given to you. When you have gotten through all of the images and received a number, input this into Delsin’s phone on your profile. Although the numbers will be different for each person, you should get a 12-digit one.
Once you have input the correct number into Delsin’s phone, you will be able to start the third mission.
You will have to track the signal with your phone, so get onto a high building to start it. This will lead you to Celia’s apartment, which will be uploaded to your online profile. When you enter, you will see various objects, such as four origami, some webbing drawn on the walls with numbers, a computer, a dead body, a letter and other things.
First and foremost, check out each origami to get them "saved" in the upper right corner. Each origami has a puzzle for you to solve to get a FAN # in accordance with the webs with numbers. Input each FAN # into the Intranet and you’ll see a memo with a single number and some question marks. That number will be important in a bit, so make sure you write it down.
Although it might be a bit confusing, an example of the above would be a number like ??-?-??-??-82 on each of the documents. Note that each person’s numbers will be different, so you must do the FAN #s with the web puzzles.
If done correctly, you should have four of the five numbers, which is actually Celia’s DUP Agent ID. For the last number, you can find yet another FAN # written on one of the walls of her apartment, so put that in to get the final one. There’s one last thing to do, which is to check the letter on the door next to the dead body. Read the first paragraph and you will find out Celia’s real name was Hitori , and she says she became Saisei , both of which are important.
Now, find the computer in Celia’s place and you’ll be presented with three questions. The first one is the DUP Agent ID you constructed (hyphens or not), the second answer is Hitori and the third, and final, answer is Saisei. You should see a mission objective for Celia if entered right, and you will have one final mission now.
There’s not much to this mission, which is the final one for the Paper Trail DLC. Chase after Celia, who will climb the DUP Tower from the final story mission, so you will need Smoke to climb up the first part. Go inside, collect the final origami dove and enjoy your rewards.
Your rewards for completing all six parts are three custom vests for Delsin, as well as a paper mask that is similar to the vests (meaning it’s selectable from the vests menu).