This is nautical themed puzzle box is a fully functional puzzle box.  This model is supplied unassembled and unpainted and includes instructions.  This is a great themed puzzle for physically hiding critical information in for your players that you want them to have to fiddle with a bit to discover.  It includes an alternate lid for customization.

Please note, you will need four ball bearings to assemble this puzzle.  They should be 5 or 6mm; these are often sold as paint agitators.