sewing box with red cross stitch panel

I am almost finished with this panel.

I like using French on my Cartonnage, so I have stitched "Couture boite" on top.

I am guessing that it means "Sewing Box".

If not, please let me know!

I am thinking of putting a button at the centre, and chose these two.

This one,

or this

I am not really sure which one to use..

thinking pig.