Problem with homeboxes and theme

Hey there everyone. I’m working on a page for a client that someone else built, and I’ve been trying to reverse engineer their set-up in order to update content. They’re running the Clarion theme, and I’m trying to change one of the images out, and I can’t figure out how it populates.

Here’s the page in question: https://www.mccainc.org/

Here’s a screenshot of what I’m talking about: https://imgur.com/l61mAZ9

Here’s the code behind it: https://i.imgur.com/WmIZmYc.png

It’s homebox code, but I can’t figure out how to change that. There don’t seem to be any pages or posts holding the content, and I’ve sifted through all of the plugins and widgets and can’t seem to find them there, either.