I'm not sure if thats the place, because theres no map, but it was in the statue square, top right building. I think I did find a keycard inside there, but the doors still needed hacking, all of them.
edit; if you remember the location, spoil it for me so I can check if i DID pick it up. I already opened all the doors so I wont be able to check if it works, but I can see if i missed it.
Also I don't buy the better prepared line. I have a regen-armor so i can convert the 10 thousand batteries i found to health, but what if someone didn't have that particular armor piece? It would be a huge difference. And considering the warehouse blocks provide you with literally every other item in the game, I'm starting to think I missed a vial stash somewhere, because it makes no sense.