Bruce took off down the hallway, trusting that Tony knew what he was talking about and grateful that he hadn't had to steal the badge. It wasn't surprising that, as a giant green rage monster, he wasn't all that great at stealth.
He sighed, wishing he'd taken up a safer profession (bomb defuser, or he could have been a teacher).
All he needed to do was show the access card to the guard at the door, and without an identifying picture, he was in the clear. Crime must have been far easier in the 1930's.
Bruce took a cursory glance around the lab, taking in the details like he might a particularly interesting museum exhibit.
He wasn't looking for the MEB at the moment, but rather a prototype containment lead-lined box that should hopefully mask the MEB from any sensors or aftereffects of time travel. Squinting at Tony's how-to note, Bruce went to the innocuous-looking safe on the wall and solved the puzzle hidden inside.
With a click, the door opened, revealing the lead-lined box, which looked like a regular delivery package. Bruce looked at Tony's note. "STEP 5:" It said in Tony's chicken-scratch writing, "High five-yourself. You are awesome."
He sighed, and then allowed himself a small grin.
Bruce left, package in hand, and trying not to stare at the man smoking-inside, he hadn't seen that for years- an actual cigar.
He got into the elevator, trying to forget about large green monsters in small, death-trappy places.
Natasha materialized next to him, not creepy at all.
He handed her the small box with a sigh, not bothering to ask where she came from, and when he turned around again at the lobby, she was already gone.