I'm still putting my new PC together, but had to post a picture of where I found the M.2 screw because it took me quite a while to find it and I want to save you some time. It's in a really small bag that looks kinda useless with a sticker of a barcode and number. The little guy is hiding in there.

On the smaller size compared to most ATX boards I've owned so be wary when choosing a CPU cooler or at least when putting things together to build it in the best order possible. Otherwise absolutely perfect.

Per recommendation, I went with this motherboard. It was extremely easy to setup. MSI has some great videos online about installing this board and where cables go. BIOS on the board was also very user friendly. I would recommend this board to someone.