Miss Pinks Craft Spot: z-Fold card dimensions
Create your own old school Robot favor box.:
Templates and instruction video for making this 3D card, but I would just make the treasure chest part as a teeny tiny box.
Lotus Lace Card & Envelope SVG eps DXF PNG Cut by ScrapCobra
I think I'm in love with this shape from the Silhouette Design Store!
Retail Box with Blueprint Template