Cut the lines on one side where your score marks intersect. Repeat this with all four corners.
You're only cutting a tiny bit to make a tab.
Put adhesive on these little tabs
Fold up your sides and adhere the corners, making a cute little box to hold your notecards.
This Top Note die cuts out a shape in the middle of the cardstock like this:
Save the piece you just cut out because I'm sure you'll find a good use for it.
I put adhesive on the corner tabs, folded up my sides, and added a piece of square Window Sheets for the window on the lid.
And then tied it all with a Satin bow.