Here are your free printable papercrafts:
Cut out the box pieces by hand or Silhouette machine, score and crease the folds. I stick the tabs with double-sided tape. Assemble the box, then turn under the tabs. The V-piece forms the lid lip. Turn under the side tabs, then fold under the. The remaining tabs are attached to the underside of the V-shaped box lid. The card is attached to the box lid with sticky squares. A sticky square holds the card shut, too. Sticky squares keep the box shut.
Ideally, the box should be filled with sweethearts - but I guess any small sweet treat will do.
And, of course, you can big up the cards for convential Valentine giving.