I Googled Vinyle soffit but all three that I've seen are aluminum at least that is what it sounds like. I suppose they are the same. I've done this many times but many years ago. I've since lost that tool, it's off to the store again.
Good eye! I had to go to Full Screen to see it. Can you say Code violation? And can you tell the folks why it should have a cover even though it's under a porch and covered up by soffit? Well for one thing mice, I've seen it. They can make a nest in there or worse yet, knaw thru the insulation.