What? Huh?

I was just in an elevator with the man that delivers sodas to the office. Here is the conversation that took place as the doors closed and the elevator started up.

“That’s a lot of soda,” I said, pointing out the obvious and displaying my amazing ability to make the most ridiculous small talk with anyone I meet.

“Yup,” he said. “I already done the fourth floor. I got to it before they did.”

“Oh, yeah?” I replied because I couldn’t think of anything else to say.

“I try to get here early, but there is only so early I can go. But it hadn’t even been touched when I got here. So now they won’t have to do it themselves” he explained.

“Okay,” I said.

At this point the door opened to the fourth floor and I stepped out.

“Thanks,” I said, although I have no idea why I should have thanked him.

I have no idea what he was talking about. What is “it” and who normally touches it? Why is he taking care of “it” instead of “they”; and who is “they”?
Hopefully he didn’t figure out that I was confused.