I've attached a picture from above in front where you see the white lip of the filter in the front left corner, which is what led me to peek at the left side. The previous picture is roughly from eye level with the left side lid seam.
I have looked everything over and everything is straight. The hinges are locked in. The three clipping points are resting on their counterpoints - the plastic upper is sitting on the plastic lower- so there's no further the lid can go. The clips engage with minimal effort.
The left side of the lid does not have an overhang like the other sides, which is why I think the lip is visible, but I wanted to get confirmation. I thought it weird that they would leave one edge/lip visible. If it's not supposed to be that way, I need to have it looked at (and will this week) to ensure the box wasn't damaged by the previously installed aftermarket filter or was flawed from the factory.