So my lovely team leader Sam (aka Pootles) made a box like this for four tealights some time ago HERE, but I have made a resized version that is just right for four Ferrero and used the fabulous new Eclectic DSP

Inhes

Cardstock BASE – 5 ½ x 5 ½

Cardstock LID – 5 9/16 x 5 9/16

Score all pieces at 1 3/8 on all four sides

On the top piece, score down at 2″ but only to the created horizontal line, turn cardstock OVER and turn ONCE to the right, then repeat

 

Cms

Cardstock BASE – 14 x 14 cm

Cardstock LID – 14.2 x 14.2cm

Score all pieces at 3.5 cm on all sides

On the top piece, score down at 5cm but only to the created horizontal line, turn cardstock OVER and turn ONCE to the right, then repeat

Panels

Top 2 5/8 x 2 5/8 (6.5 x 6.5 cm)

Sides 2 5/8 x 1 ¼ (6.5 x 3 cm)