You put the armor on that Bob has at his quarters, and you put the ID of his in the utility item slot or somesuch, and they should let you in. However, going this route still is not total easy, as you cannot get near the people in the warehouse nonetheless for too long without being outed, and sneaking still helps.
I think I even switched out of the armor once inside and in the far corner of the warehouse while alone, into more sneaking appropriate clothes and did it all in stealth before exiting out the pipe stuff in the basement after using the ID to get in the front way...