Missing mtb bottom bracket cable guide screw? 2016 Diamondback Haanjo Comp

I was giving the bike a bit of a wipedown today and noticed a missing screw on the bottom.



I've been unable to find any specifications such as this from DB.

Can I figure this out without taking it apart?  (I don't want to take the other screw out since it looks like I'd have a mess on my hands.

Does anybody have an idea what screw I need to get and where to get it?
If you are concerned about the empty hole next to the Phillips head screw, you can ease your concern. The cable guide typically only needs a single mounting screw. The extra hole allows the same cable guide to fit a variety of bikes by  shifting the guide towards the drive or non drive side depending on which hole is used.