Stop for a minute and think about that: You have to prove you're you just to deposit a check, right? Why are you letting yourself believe that security at these facilities is so apathetic that they'll let a guy in as long as he kinda looks like he belongs there?
First of all, we'd never let someone in just because they have a uniform. The uniforms go home with the employees, where they can be lost or sold. They're pants. Pants are not a qualification. What we have instead are tightly controlled ID cards that are checked in, checked out, and counted every night. Every store manager has a card that they scan in order to make the pick-up or drop-off, and then they sign it in a specific book. If you lose your ID by accident, it's an automatic termination.
If you "lose" your ID on purpose, it's an automatic incarceration.
From the front of the building to any room with money in it, there are about five mag-lock doors, and no one goes through them without an escort. Even if I personally know you as a fellow guard, if you're not scheduled to work that day, I can't let you in without an escort. If you're the president of the United States, you're not allowed in without an escort. That also means you have your identity verified and you're patted and wanded down. Which is nowhere near as sexy or as magical as it sounds.