How to find the blueprint for the 25 slot storage box in the current (early access launch) version of the game. Some story spoilers.
Finding the Box
Out of the elevator turn left.
Then keep following left.
When you get out into the street, go right.
On the left if you haven’t already, extract the metal panel with the hand extractor, and proceed through, past the the hypothermia plant, the box to scan is on your left.
Congrats, enjoy your massively expanded storage solution! (When you need it the least..)