There are four "Men in Boxes" in MGRR and some of you will be reminded of them from earlier Metal Gear Solid titles. Basically you need them all to get the Peekaboo achievement.
The locations are as follows:
Man in Box 1
He is in R01 in the main factory room. There are lots of crates near the door that you exit the area through. Drop into the crates and there will be a spotlight shining on one in particular. Destroy it to find the man in the box.
Man in Box 2
He is in R02. After you have been in the room with the two generators and are in the sewer area where Wolfs talks to you about finding the entrance there is a door you need to slice apart. The man in box is inside!
Man in Box 3
This man is in R03. Once the Mule Mech fight in the office you'll go into a hall. The man in box is on the left.
Man in Box 4
This man in box is in R04. You come to a cargo lift to get the top of a building. Once you get to the top you must Ninja Dash through a small opening at the top of the crates on the right. You'll then be in a small hall and the box is mixed in with some normal crates.
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