In a previous episode, the sweet old lady told Irving that they used to take equipment down the elevator themselves. But now a guy comes to take it from them. I'm under the impression that this whistling dude is the one.
And that whistling sounded like an actual song, so now I'm thinking he might not be severed.
Nope, that hasn't been revealed to us. They've thrown the name around a couple of times, so I think they are really trying (and succeeding) at ramping up our curiosity 👀